You should just play with it imo. I tried the tutorials at first, but they never really helps you understanding what it precisely does to your sound, and the fact is that the same knob won't have exactly the same effect, depending on the type of sound you're trying to create and how you modulate it.
You won't use it the same way as another producers simply because you're not going to design the same sound, so I think the better thing to do is to learn your own way to use it, so it will correspond to what you are.