There are typing classes? I never had any of those.
Well, I usually start by having my left fingers on A, S, D, F and my thumb on Space, my right fingers on K, O, [, ] and my right thumb also on Space, but when I start typing that arrangement completely goes away, my fingers just fly across the keyboard. I just seem to know where all the keys are off by heart, somehow. I can't recall where they are without a keyboard, but I can figure it out by moving my fingers in the air.