Well Im actually not that fast! I'm doing 1:58 - 2:05s and my friends are doing 1:45's - 1:52's I learned I need to remember to weight the inside peg and get the hell of the bike with my head off too. The problem is when you do that the bike turns in so quick you almost run off the inside of the track. So I'm still learning. I may race a few races next year in AFM but not sure if I want to get back in it or not.
Well I learned from Racing 50cc YSRs then 80's then 125's and so on! I learned from reading books like Twist of the wrist, other riders, crashing, and track time but mostly from other faster riders. Now days you can get instruction from the track day instructors that makes it easer.