Used specifically for questions that are generally about Jewish holidays on which activity is heavily restricted (first and last days of Pesach, Shavuot, Rosh Hashana, Yom Kippur, first day(s) of Sukkot, and Shemini Ateret). But use [chagim-holidays] for questions about Jewish holidays in more ...
Based on my understanding... One is not allowed to make preparations on the 1st day of Yom Tov for the 2nd day. An Eruv Tavshilin allows one to cook, bake and make food preparations on Friday for ...
It says in SA OC Siman 471 in the Rema Sif 3 that it's a mitzvah to take shower/bath and cut ones hair Erev Yom Tov. As well to wear "Bigadim Noim" (nice clothing) "c'mo Shabbos" (like on Shabbos.) ...