Cilantro works well in marinades, and a large variety of other dishes. It comes either dried or fresh. You should ignore the dried variety, as the fresh product should be readily available. It will go bad if left in your refrigerator for over a week, so buy it as you need it. Chile powder sticks out in my mind as representing everything that is bad about American cuisine.
Chile powder is generally an anemic mixture of mild chile peppers, cumin, oregano, salt, and garlic.
For generations, American cooks were paralyzed by this mixture, and in some sick sacred awe of it, they forsook the individual ingredients which composed it. If you really want to, go ahead and buy some. It might come in handy someday. But don't let yourself become seduced by it as your parents undoubtedly did. Chives are the anemic kid brother of the green onion.