As soon as Yom Kippur is out, we shift gears for the next holiday, the joyous festival of Sukkot. The core mitzvah of that holiday is the sukkah. A sukkah is a hut built to provide shade. That's why it must sit beneath the open sky—not under a patio deck or even the branches of a tree.
For eight days, make the sukkah your official home. Don't panic: As long as you eat your meals there, you're okay. But try to include anything else that you would normally do in the house—like reading a book or talking with a friend. We sit in the sukkah from sundown on the 14th of Tishrei through nightfall of the 22nd of Tishrei. It is a mitzvah to eat all meals in the sukkah (a "meal" is defined as more than two ounces of grains -- e.g. bread, cake, pasta). Some people have the custom of eating snacks in the sukkah as well.