It is preferable to recite Hallel with the community; when doing so, certain verses are repeated.

The blessings recited over Hallel; half- vs. full Hallel; reciting Hallel alone vs. with a minyan.

The significance of Tisha b'Av goes beyond fasting and even beyond mourning. What are we to learn from Tisha b'Av?

Summary and overview of all the special aspects of Shabbos Erev Tisha b'Av.

On motzei shabbos erev Tisha b'Av, we cannot drink wine. How do we make havdala?

On Shabbos, the third meal usual extends past sunset into the night; on Erev Tisha b'Av, we begin fasting at sunset. So what do we do when Erev Tisha b'Av falls on Shabbos?

In general, we don't launder or wear clean clothes, take haircuts, or wash during the nine days. What about lichvod shabbat?

On Shabbos Rosh Chodesh Menachem Av, do we read the haftarah for Rosh Chodesh or for the Tlat d'Puranuta? Also: the brachot for the haftorah and musaf on Shabbos Rosh Chodesh.

Overview and summary of the history and halachot of the Three Weeks

We make havdala following Yom Tov, but we don't include the candle or spices. Why?

Staying awak all night on Shavuos may compensate for our oversleeping when the Torah was given. Also: handling the morning blessings for those who haven't slept.

We must always regard mitzvot respectfully, never putting ourselves above a mitzvah.

Introduction to chinuch: a look at Kiddush Lavana and Kriat Shema.

Kiddush Lavana customs are all about the joy of the relationship between Hashem and His people, and the joy associated with Kiddush Lavana reflects this relationship.

Kiddush Lavana is a time of joy, and many of its halachot and customs reflect this. So can a mourner say Kiddush Lavana? We are supposed to enjoy the light of the moon as part of the reason for the blessing, but do we look at the moon while reciting Kiddush Lavana?

Kiddush Lavana is ideally said on Motzei Shabbos or Motzei Yom Tov. What about after a fast day? This shiur discusses Yom Kippur, Tisha B'Av, Asara B'Tevet, Ta'anit Ester, and other Taaniot.

What are the earliest and latest dates in the monthly lunar cycle when Kiddush Levana can be recited? Why?

The ideal time for Kiddush Lavana is Motzei Shabbos -- within reason. Also: a brief summary of the works of Rav Yosef Caro, plus a bit of angeology.

L'ilui nishmat Moshe ben Hirsh on the occasion of his yahrzeit.

Who is obligated to recite Kiddush Levana? Do you have to see the moon to say it? When is it said?

Introduction to Kiddush Levana -- the mitzvah of sanctifying the new moon.

The "Ot-Bosh" of Pesach is one of the many wonders of the Jewish Calendar.

Why do we eat eggs at the seder? Why is there an egg on the seder plate?

Dedicated for a refuah shleimah for Breina bas Frieda.

If you forget to make up for havdala in the second bracha, you have additional opportunities through the meal, the seder, and beyond. Also: washing hands for kiddush.

If you forget to make Havdala in Kiddush, how do you make up for your ommission?

The Kiddush of Pesach on Motzei Shabbos is special in that it includes both Shehechiyanu and Havdala.

Dedicated as a zechut l'ilui nishmat Shaul ben Chana z"l for a refuah shleimah for Breina bas Frieda.

In the middle of the Pesach Seder, we recite Hallel; in the middle of Hallel, we interrupt to eat. How can we interrupt Hallel in the middle? Also: There are two special changes in Maariv for Pesach: many communities recite Hallel, and there is no Kiddush in shul.

Dedicated for a refuah shleimah for Breina bas Frieda and Tamar bat Sigalit.

The special evening prayers for Erev Pesach.

Dedicated for a refuah shleimah for Breina bas Frieda.

Who was Ahashveirosh who made a 180-day party? Why is it important that he sat on his throne in Shushan, his capitol city; isn't that what all kings do?

An introduction to the first few verses of the Megilla as an example of the rabbinic exegetic process.

If you must be away for Purim such that you won't have an opportunity to hear the megilla at the right time, what should you do?

When Shushan Purim falls on Shabbos, Jews in walled cities celebrate Purim for three days!

A dweller of a walled city who goes to a village for Purim or vice versa... when does he read the Megilla? Also: Two Biblical walled cities of questionable status.

Halachot for situations when you are unsure whether to observer Purim on the 14th or 15th of Adar, including questionably walled cities, and an introduction to people who travel to or from walled cities for Purim.

The status of various cities -- modern Jerusalem, Shushan, Jaffa, Tiberias, Hebron, and more.

Most of us celebrate Purim on the fourteenth of Adar, but certain cities, like Shushan, celebrate on the fifteenth.

The halachic implications of the added month in a leap year: Bar Mitzvah, bechor, rentals, mourning, korbanot, and more.

During a leap year, just how long is a "year," and what are the halachic implications of the added month?

How do we record the date in halachic documents during the two months of Adar in a leap year? What about the two days of Rosh Chodesh? Also: a general overview of the Jewish Calendar.

In a leap year, are there any customs associated with Purim Katan, the 14th and 15th of Adar I?

In a leap year, are events observed in Adar 1 or Adar 2?

Choosing whole matzos from among broken matzos is a problem of borrer that presents itself every Pesach.

The order of the Torah reading, the reason for four aliyot, and the division of the aliyot on Rosh Chodesh.

Halachic details regarding the proper blessing for the recitation of half-hallel, including when to make and not make a bracha on hallel.

Given as a zechut for a refuah shleima for Tamar bat Sigalit.

What if you accidentally include ya'aleh v'yavo in a weekday amidah?

If ya'aleh v'yavo is forgotten on Rosh Chodesh at mincha, can you make up for it in the following ma'ariv?

One who forgets aneinu on a fast day does not go back to insert it. But the halacha is quite different for an individual as compared to the shaliach tzibbur.

In memory of Tamar Rivkah bas Sheur Zalman on the occasion of her yahrzeit.

On the eigth day of Chanukah, we read "Zot Chanukah", the dedication of the mishkan, including the lighting of the menorah. There is more to this then the obvious similarity of the events.

In memory of Moshe ben Chaim on the occasion of his 36th yahrzeit.

On Rosh Chodesh Chanukah, we read from two sifrei Torah. But how do we divide up the aliyot between Rosh Chodesh and Chanukah? Also: what if we accidentally take out only one sefer Torah or begin reading from the wrong sefer Torah?

Oils and wicks that are prohibited for shabbos candles are permissible for Chanukah candles. What is the difference between Chanukah and shabbos that we treat the halacha of their candles differently?

While we don't know exactly when Yosef was sold into slavery, there are hints that he was sold on Chanukah.

Birkat HaMazon on shabbos when Rosh Chodesh falls on Sunday (part 2). Do we include r'tzei for shabbos, Ya'aleh v'Yavo for Rosh Chodesh, or both?

When Rosh Chodesh falls on Sunday, there is a special haftara reading. Also: Birkat HaMazon on shabbos when Rosh Chodesh falls on Sunday (part 1).

Why was the Haftara for Rosh Chodesh on Shabbos chosen?

When Rosh Chodesh falls on Shabbos we add Ya'aleh v'Yavo, read a special Rosh Chodesh Maftir, and recite a special haftara.

Dedicated in memory of Shnuer Zalman ben Shlomo on the occasion of his yahrzeit.

The Sukkot decorations stay on the sukkah walls until after Shmini Atzeret. Why? Also: the prayer for leaving the sukkah for the last time; preparing on Yom Tov for shabbos.

It is forbidden to smell the hadas but permitted to smell the etrog. What is the difference between them, and what is the prohibition about?

Why do we wave an Etrog on Sukkos? How do we know that the "pre etz hadar" is an Etrog?

After Yom Kippur, we rush to do several mitzvot, among them building the sukkah. We also leave out tachunun as the days until Sukkos have a quasi Yom Tov status. What is the connection between these themes?

Dedicated as a zechut for a refuah shleima for Moshe ben Ester Ruchel.

Why do we dwell in a Sukkah?

We eliminate several prayers on Erev Yom Kippur, including LaMinatzeach, Mizmor L'Todah, and Tachnun -- though each is eliminated for a different reason. Slichot are shortened and Avinu Malkeinu is skipped.

Most of us eat on the day before Yom Kippur to prepare ourselves for the upcoming fast. But it is actually a mitzvah to eat on Erev Yom Kippur. Why is that?

What is an Eruv Tavshilin? When, why, and how do we make an Eruv Tavshilin? Isn't this just a "legal loophole" -- if cooking is forbidden, how does the Eruv help, and if it is permitted, what is the point of the Eruv?

Join Rav Dovid for a corporate "Lunch and Learn" discussion on relating to the High Holidays in our modern times. What makes the Yomim Noraim relevant for us today? Is this just a bunch of "New Year's Resolutions" that, like all other such resolutions, will be forgotten within days of Yom Kippur? How should we relate to Rosh HaShanah, and why do these Holidays occur back-to-back on the calendar?

Also: The Rama encourages us to do teshuva and recommends that we read the Iggeret HaTeshuva of Rabbeinu Yonah each day.

Dedicated as a zechut for a refuah shleima for Yeshua Yaakov ben Froma.

Haircuts, clean clothes, mikveh, trips to the cemetery, and tzedakah.

The Ba'al HaTurim brings down remez and sod to tell us why we recite selichot prior to Rosh HaShanah.

Selichot should be recited even without a minyan, though the 13 attributes are omitted. All of the Rosh HaShanah prayers -- including selichot -- should be prepared in advance so that they can be recited comfortably in shul. The goal is to focus on davening, not on trying to read the tefilla.

Why do selichot always start on Saturday night? Why are selichot said so early in the morning, and without tallis and tefillin? Why does the chazan where a tallis?

Halacha l'ma'aseh: the brachot for hallel on Rosh Chodesh; reciting hallel as an individual vs. with the community; arriving late to shul while the community is reciting hallel.

Dedicated l'ilui nishmat Perel Yetta bas Yehudah Leib on the occasion of her yahrzeit.

Why do we recite Hallel on Rosh Chodesh, and what are the halachot and dinim regarding the brachos?

Dedicated for a refuah shleimah for Yeshua Ya'akov ben Froma.

Some people fast every Erev Rosh Chodesh for Yom Kippur Katan. What's it all about?

Why do we recite L'David Ori during the entire month of Elul? And why is the season of teshuva so long?

Customs of Elul: selichot, shofar, and Hashem Ori.

There are leniencies in the restrictions regarding haircuts during the three weeks for mourners just coming out of shloshim and for children's clothing. Also: avoiding the evil forces that lurk about during the three weeks.

Kiddush Levana is a time of joy, so it is delayed until after Tisha B'Av. Meat and wine are not eaten during the Nine Days, but what about at a seudat mitzvah?

An overview of all the halachot appertaining to the Nine Days from Rosh Chodesh Av until Tisha B'Av, plus the details on laundering, new clothes, and freshly-pressed clothes.

Many tragedies befell the Jewish people in the month of Av, from the sin of the spies to the death of Aharon HaCohen.

The tlata d'puranuta -- three calamaties.

If you are awake all night, does one say Birkot HaTorah the following morning? What if you slept a little? What if you wake up to learn in the middle of the night -- are brachot required prior to learning? Halachah l'ma'aseh for Shavuot.

If Lag B'Omer falls on Sunday, there are some leniencies available for Ashkenazim with regard to haircuts on Erev Shabbos.

In memory of Mendel Meyer ben Motel on the occasion of his Yahrzeit and for a refuah shleimah for Chaim Bear ben Perel Yitta.

The same principle with regard to doubt -- that it takes thirty days to establish a new habit -- can also be used to resolve doubts by establishing a new habit with regard to saying tal or geshem.

We get so used to the words of the amidah and have such poor focus on our tefillah that sometimes, perhaps even often, we don't know whether we said tal or geshem. What is the halacha in such a case?

The fasts of BaHa"B are held twice a year following both Pesach and Sukkos. This shiur explores the reasons behind the fasts and brings out the relevant halachot of BaHa"B.

On Rosh Chodesh, Ashkenazic Jews add the Musaf Rosh Chodesh to the reading of the morning korbanot. Why? Are shabbos and Yom Tov the same or different? How and why?

In memory of Moshe ben Hirsh on the occasion of his Yahrzeit and in memory of Minna bas Avraham on the occasion of her Yahrzeit.

On Rosh Chodesh, Ashkenazic Jews add the Musaf Rosh Chodesh to the reading of the morning korbanot. Why? Are shabbos and Yom Tov the same or different? How and why?

If you add Morid HaGeshem when you shouldn't you need to correct the error. But how do you correct it? That depends on several variables -- whether you added geshem on purpose or by accident and when you realize your mistake.

Dedicated for a refuah shleima for Saritte bat Aliza Sali

Overview and summary of the various halachot regarding Sefirat HaOmer.

If you accidentally add or forget "Morid HaTal", you generally need not correct the error. Why not? What if you request tal by accident in barech aleinu?

Many of the dinim of ta'aruvos come into play with regard to chometz on Pesach. This chevruta shiur provides an overview of bitul chometz.

After musaf of the first day of Pesach, we stop davening for rain in the amidah. What if you ask for rain by accident?

Even after Pesach has ended, there are still chometz prohibitions that we must be concerned about. Chometz owned by a Jew during Pesach becomes permanently forbidden. But what if a non-Jew gives it to you? Leaves it in your home?

Does each of the four cups require its own brocha rishona? Brocha achrona? Why or why not?

The shabbos before Pesach is known as "The Great Shabbos -- Shabbat HaGadol. Why is it called "Great", and what are the customs associated with this special shabbos?

Are women obligated to drink the four cups of wine? What about the rest of the seder obligations? What is a child's role at the seder?

The general rule: use the best wine you can afford.

Why do we drink four cups of wine? How much wine should you drink?

If one forgets to lean at the seder, is he required to go back, or has he fulfilled his mitzvah nonetheless?

Does a child recline in front of his father to whom he is required to show honor? What about a student in front of his Rabbi?

Dedicated for a refuah shleima for Aliza Sali bas Tzipora

Do women lean at the seder? What about mourners?

At the seder, we all lean to the left, even those who are left-handed. Why?

The seder table is set with one's finest of everything. The Maharil would even decorate his seder table with non-kosher plates and cups!

We start the seder immediately after dark, in part to make sure the kids are awake.

Keilim used with chometz that cannot be cleaned properly or that contain more than a kazayit of chometz must be given to a non-Jew. Also: toasters, cat litter made from dried corn, and the difference between Listerene and beer shampoo.

Chometz dispersed around the house and non-food chometz, including beer shampoo, buckwheat pillows, and beanbags.

What are we required to clean, what to we clean out of legitimate chumra, what is "customary" to clean, and what is just plain foolish? Halachic guidelines to follow in Pesach cleaning.

Ink and other non-foods containing chometz are not an issue to own or use, so long as the chometz was mixed in prior to Pesach. Beer, booze, and other foods, even with just a taste of chomeetz are completely forbidden.

Chometz medications, glues, and starch in clothes.

Bread that is so rotten that a dog wouldn't eat it is no longer chometz. But can we own it on Pesach?

The different categories of ta'arovet chometz and chometz nukshe.

Is it permitted to own mixtures of chometz on Pesach -- for example, beer, wheat-based paste, and paper mache? What is chometz nukshe, and is its din the same or different?

Is it permitted to own mixtures of chometz on Pesach -- for example, beer, wheat-based paste, and paper mache?

What if you forget al hanissim in birkat hamazon? Also: what if Purim falls before or after shabbos and your meal begins in the day and continues into the night -- can you say both al hanissim and r'tzei?

Matanot L'Evyonim and Mishloach Manot are mitzvot that enhance the communal joy of Purim and increase the loving brotherhood of all Jews for each other.

The obligations of half-slaves, androginus, and tumtum; reading megilla without a minyan: odd situations that demonstrate the halachic importance of hearing the megilla read.

Is the obligation to read the Megilla, or is the obligation to hear it read? Is the obligation the same for men and women? Can women read the megilla in public? Can women read it for men?

Megilla is so important that we put aside (almost) any other mitzvah to read the megilla -- even a mitzvah d'oraita.

Also: what if you forget to read one of the four parshiyot?

In general, we omit tachanun on holidays and at mincha on the day prior to the holiday, though there are exceptions.

Prior to Rosh Chodesh and other events that come less frequently than once a month, we prepare the prayers in order to recite them fluently.

The 8th and 9th of Tevet are among the lesser known fast days that are, in general, publicly observed.

In general, when we rise for the amidah we turn toward Jerusalem, which in the US means facing East. But we may also face South -- toward the Menorah, or North, toward the Table. Just what is this directionality about?

On Erev Shabbos -- and even on a weekday -- one should take care not to place Chanukah candles where they may be blown out by the wind.

What is the Torah reading for Chanukah and why? What do we read on shabbos? Rosh Chodesh?

Chanukah is a holiday of thanks and praise expressed by, among other things, the daily recitation of Hallel.

Why doesn't al hanisim mention the nes of the oil? Adding al hanissim to birkat hamazon and the amidah; what if you forget al hanissim?

Today, we in the US generally don't put our Chanukah candles outside. But they should be placed in a window nonetheless. Where is the best place to put them?

Dedicated for zechus for the release of captive Israeli soldiers.

When lighting Chanukah candles before Shabbos, it is best to daven Mincha first -- especially if it's the first night. Why? And what if you can't?

Dedicated for chizuk for Oritte bat Aliza.

Where is the best place to light your Chanukah candles?

Each Chanukah candle must be separate and distinct, and all must stand in a row, none more or less important than another.

Chanukah has mystical origins that go all the way back to Creation. In fact, Chanukah is woven into the very fabric of the universe.

Dedicated in honor of Rabbi Joseph Hager.

Why is Chanukah the only holiday where there is no festive meal? What does the joy of Chanukah celebrate?

Various lesser-known aspects of Chanukah: prohibitions on eulogies and fasting; women's freedom from work while the candles are burning; the courageous acts of Yehudit, the daughter of Yochanan the High Priest, and more.

The introduction to Chanukah as brought in the Mishnah Brurah.

The shaliach tzibbur generally goes back to make up for a missed ya'alei v'yavo, though he would not repeat the entire amidah. Why not? What does he do instead?

An individual who forgets Ya'alei v'Yavo can fulfill his obligation along with the shaliach tzibur... or can he?

On the shabbos before Rosh Chodesh, we announce the upcoming month. Also, if Rosh Chodesh falls on Sunday, we read a special haftarah on Shabbos.

What to do if you leave out (or aren't sure if you said) mashiv haruach, with all the sources and all the details.

The kahal does not begin to say mashiv haruach until it has been announced. But what if you don't hear it?

Topics covered: Why do we begin mashiv haruach on Shmini Atzeret? Why do we say it in the second brocha, the brocha of gevurot? What if you leave out mashiv haruach by accident?

What does it mean to "dwell" in the Sukkah? In brief, we live in the Sukkah as we live in our homes the rest of the year... though in practice, it's a bit more complicated...

Can you borrow a sukkah? Share one? What if you steal a sukkah?

There is a mitzvah to feel happy on Sukkos. How can Hashem command us to feel joy!?

Can you put up a sukkah on chol hamoed? What about on Yom Tov?

Like all our Holidays, Sukkos has an element of chinuch: buy a lulav for your kids if they can wave it.

For a mitzvah aseh, one should be prepared to spend up to 1/5 of his assets. But to avoid a lo ta'aseh? Be prepared to give up everything.

The Talmud learns that we should spend up to 1/3 extra for a beautiful etrog. How do we apply this halacha?

Why do we dwell in sukkos for seven days? And why this time of year?

On the day before Rosh HaShanah, we do not say tachanun nor blow shofar.

Why all the different and repeated shofar blasts? It confuses the Soton.

On Rosh HaShanah, all people pass before Hashem for His review and judgement.

The selichos are a sublime petition for forgiveness. Their origin? From the Heavens themselves.

Both the chazan and ba'al tokea (shofar blower) must be Torah observant, married, and over age 30.

What is the impact of Teshuva on a Jew's portion of Olam HaBa?

The Rambam's famous understanding of the call of the shofar -- "Awake, sleepers, from your slumber!"

In memory of Chaya Sarah bas Micha'el HaLevi on the occasion of her yahrzeit.

The books are open: the Book of Life for the righteous and the Book of Death for the wicked; the rest of us hang in the balance.

Dedicated for a refuah shleimah for Mori v'Rabi, HaRav Shlomo Yitzchak ben Elka, shlit"a.

We should always see ourselves as half guilty, half innocent -- one more aveira and our sentence will be sealed.

Dedicated by Ronald and Marion Stein l'ilui nishmat Hinde bas Hersh on the occasion of her yahrzeit.

What makes Elul such an auspicious time for reconciling ourselves with Hashem?

Given as a zechus for a refuah shleima for Ariella Rivkah bas Devora Pessel.

We begin blowing the shofar daily from Rosh Chodesh Elul. Why all the different sounds?

The four levels of transgression and the requirements of kaporah for each.

Teshuva and the se'ir hamishtaleach of Yom Kippur.

The obligation to rend one's garments at the sight of the destroyed Cities of Judah, Jerusalem, and the Temple.

Restrictions on meat, wine, shaving, haircuts, and washing continue into the 10th of Av, though there are leniencies when the 10th falls on Friday.

Nachem, a special prayer for Tisha B'Av is added to boneh Yerushalayim. Aneinu is added as on all fast days. There are no selichot nor is tachnun recited, both due to the fact that Tisha B'Av is a moed.

Summary of the hilchot Tisha B'Av.

Tallis and tefillin are not worn at shacharit onTisha B'Av. Why? Also: sleeping on the floor or without a pillow.

Take the day off if possible, and avoid greeting others.

Ma'ariv, Eicha, and sitting on the floor.

The parameters of the prohibitions on annointing with oil and wearing shoes.

Marital relations are forbidden, but does the prohibition have all the stringencies of niddah? Introduction to the prohibition of working on Tisha B'Av.

The first of the five afflictions: Torah study. What is prohibited, what is allowed?

On Tisha b'Av, the restrictions on eating, drinking, and washing are identical to the restrictions on Yom Kippur.

The five afflictions of Tisha b'Av and the acceptance of the fast.

A variety of (raw) fruits, cheeses, and dairy products are permitted, though a mourner's meal is best. Also: why do we skip tachnun at minchah?

L'ilui nishmat Chaim ben Micha'el on the occasion of his yahrzeit.

The Seudah HaMafseket is a simple meal, with one simple cooked dish and no wine.

The Talmud lists five calamities that befell the Jewish People on Shiva Asar b'Tamuz.

What is the seudah hamafseket eaten on Erev Tisha b'Av?

L'ilui nishmat Avraham ben Leib on the occasion of his 25th yahrzeit.

Prohibitions on washing and bathing during the Three Weeks. Avoiding missing opportunities to say shehechiyanu.

Prohibitions on meat and wine; more on haircuts and shaving; summary of the mourning customs of the Three Weeks.

Haircuts and clean or new clothes are avoided as a sign of mourning.

During the Nine Days or Three Weeks, we diminish our joy in all endeavors, whether for business or pleasure.

Introduction to the mourning period leading up to Tisha b'Av.

An overview of the four fasts: the 10th of Tevet, the 17th of Tamuz, the 9th of Av, and the 3rd of Tishrei.

The 9th of Tamuz is a fast day for a ba'al nefesh. Why is it not a fast day for the rest of us?

Part of the observance of Rosh Chodesh includes adding ya'aleh v'yavo in Birkat HaMazon. What if it is forgotten? Also: mentioning the Rosh Chodesh sacrifices as part of korbonot.

Not quite as extravagant as shabbos, the Rosh Chodesh meal is a mitzvah nonetheless.

Is Shavuot the time of the giving of Torah or the time of our reciept of Torah? What is the difference?

For those who follow the Rama's custom and eat meat after the dairy meal on Shavuot, there are certain rules of kashrus to be aware of.

Torah and Haftara readings, Akdamut, decorating the shul with plants, smelling grasses, and eating dairy.

Why do we stay awake all night for Shavuos? What if you get tired?

What did Moshe experience when he rose to the Heavens to receive the Torah? What do we learn from his experience? In this "Lunch and Learn Discussion", Rav Dovid discusses the Talmud's account of Moshe's experience and the many challenging issues it raises.

The significance of the special haftara reading for when Rosh Chodesh falls on Sunday; also, the first days of Sivan leading up to Shavuot.

Five central questions of living a Jewish life: What is the Torah? Why did Hashem give it to the Jews? What is the relationship of non-Jews to the Torah? How do we know it is true? If it is true, why do so few people believe it?

A walk through the Yom Tov Amidah for Shavuot, based on Kuntres Avodat HaTefilla.

The 14th of Iyar is Pesach Sheini, the "Second Passover." What is this minor holiday about?

Sefirat HaOmer has become a period when we work on improving ourselves in preparation for receiving the Torah on Shavuot.

Why is the Omer period a time of semi-mourning? Rabbi Akiva's 12,000 pairs of students.

What if you forget to count? What if you aren't sure? Also: the din of chadash.

If you forget to say Ya'aleh v'Yavo, should you repeat the amidah?

Can you count after Shkiya? Plag HaMincha? What if you start the brocha thinking today is the 4th day but it is actually the 5th?

What if you count days but not weeks or vice versa? What if you count before dark?

Why do we count the Omer? Is it d'oraita or d'rabbanan?

After Pesach, you can't quite go buy whatever chometz you want...

Why don't we say Mizmor L'Todah on Pesach? Why do firstborn children fast on Erev Pesach? Who is obligated to fast?

The prohibition on working on the 14th of Nissan; the prohibition on designating meat for Pesach.

Why is chometz sold to a non-Jew prior to Pesach permitted? Also: What is the status of your pre-schooler's shellacked noodle basket on Pesach? What about paste made from flour? Beer shampoo? Perfume?

Dedicated for a refuah shleima for Shoshana Lea bat Yehudit.

An overview of the special procedures followed for baking Pesach matzo.

Why do we sell our chometz? What can be sold?

What should you do if you find chometz during Pesach? What if you didn't check properly before Pesach?

After checking for chometz, we nullify all remaining chometz. Why isn't either checking or nullification enough on its own?

From kiddush through the start of the maggid.

What do we do with remaining chometz after checking for chometz?

Halachot beginning with Rosh Chodesh Nissan

In what rooms is checking required? What about outdoors

Must a candle be used? What if you check before nighttime? Can a flashlight be used?

Who is trusted to check for chometz? If multiple people are checking or if you are checking more than one place, do you make more than one brocha?

What is the blessing before checking for chometz and why? When is it recited?

What takes precedence, checking for chometz or learning Torah? Checking for chometz or Ma'ariv?

Why do we have to remove chometz if we nullify it? And why the need to nullify it if we remove it?

The reading of Parshat Parah on the Shabbos after Purim.

Also: Why are some verses recited aloud by all?