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Yeast 101: Active Dry Yeast, Instant Yeast, Baking Soda, Baking Powder. Differences and Info [closed]

I'm a little confused as to what are the difference between them, when should I use which? Also, how long is the lifespan and proper care after opening of these products? If I don't bake that often ...
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Does nutritional yeast expire or go bad?

I have a tub of nutritional yeast with a "best by" date of February 2012 (at the time of this posting, it's about a month past that). Is it still good to use? It still looks and smells the same as it ...