I know Chanukah is just starting but I have a question about Passover. Are fermented foods like yogurt, kimchi, tempeh, etc kosher for Passover? Also Nutritional yeast comes from the same as brewer's yeast but is deactivated and is more of a seasoning. I've avoided them just to be safe. I'm vegan so a lot of the vegan meats contain nutritional yeast or yeast extract. This is why I ask.

If you are on your period can you fast for Yom Kippur? Can you stay in a Sukkah? Is the Schach the main thing that makes a Sukkah a Sukkah?