General Yom Tov Halachot
This is the approved revision of this page, as well as being the most recent.
Preparation for Yom Tov 30 Days in Advance
- Many hold that thirty days before Sukkot one should start learning the halachot of Sukkot.  All agree that on the holiday itself one should learn the halachot of Sukkot. 
- This doesn't mean that a talmid chacham should stop this regular learning to learn halacha of the upcoming holiday, but rather it means that a question about hilchot pesach is given precedence to questions not about pesach.
Erev Yom Tov
- It's forbidden to make a festive meal on Erev Yom Tov which one wouldn't normally have during the week. 
- One shouldn't have a meal after nine hours in the day just like on Erev Shabbat. See Not eating on Erev Shabbat. 
Kavod and Oneg Yom Tov
Meals of Yom Tov
- One should have Lechem Mishneh (two loaves of bread) for the two meals of Yom Tov. See Lechem Mishneh. 
- Although the main obligation of aliya laregel during the times of the Beit Hamikdash was to bring korbanot, there is still a mitzvah nowadays to visit Yerushalayim and particularly the Kotel Hamaaravi. 
- In Gemara Pesachim 6a, Rabbanan hold that one should begin to learn Hilchot Pesach thirty days in advance of Pesach, whereas Rabban Shimon Ben Gamliel holds only 2 weeks. Rabbanan learn this idea from Moshe who taught the laws of Pesach Sheni thirty days in advance which was Pesach in Nissan. Shulchan Aruch 429:1 rules like the opinion of the Rabbanan. Mishna Brurah 429:1 writes that according to Rashi, Tosfot, and the Gra the same is true of other Yamim Tovim such as Sukkot, however, according to the Bet Yosef there is only a thirty day period in reference to Pesach.
- Gemara Megillah 32b states that one should learn the halachot of Sukkot on Sukkot. Mishna Brurah 429:1 quotes this as halacha.
- Chazon Ovadyah (Pesach pg 1) explains that the halacha in Gemara Pesachim 6a is relevant in regards to the laws established in Tosefta Sanhedrin 7:5 which state that a person should ask relevant questions and a relevant question has precedence over the irrelevant questions.
- Rama 529:1, Mishna Brurah 249:8
- Rama 529:1
- Mishna Brurah 249:8
- Rama 529:1, Mishna Brurah 529:9
- Sh"t Yechave Daat 1:25, Sh"t Kol Mevaser 2:10. see also Rabbi Yosef Kalinsky and Igrot Moshe YD 3:122