I love compressors and compression and how it can make or break a track. I like how it takes finesse to do, that aspect appeals to me. But there is one thing I don't fully understand. Attack time. Release is easy enough to understand. Set it so that it releases gradually enough that you don't hear it, but not so long that it's like a clingy girlfriend. I just hope someone can explain the theory behind attack, because I can't think of one, certainly not one larger than 10ms.