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When/how do I use capcitors? Answered

I feel a little in the dark after taking this lesson. So, it seems like a capacitor is a kind of voltage regulator? When am I going to use them? How do I know when it would be useful to use one and how do I start figuring out what value I need?
I saw that you said the value was based on the specific project and hard to give a blanket statement but I don't feel any more prepared to use capacitors now then I did before reading this coarse material.