I learned that I'm not a fumble-fingered idiot. Aircraft handling in AH takes practice.
I learned that landing without your gear down is a bad thing.
I learned that having trainers in the game is a good thing.
I learned that there are some good people in the game that are willing to help out a noob.
I learned that there are some good people in the game that are willing to shoot a noob's bellybutton off.
I learned that both of these can teach you a lot.
I learned that a higher monthly subscription fee seems to keep the l337 griefer count to a minimum.
I learned that, given pilots of equal skill, the plane that is easier to fly is usually easier to shoot down.
I learned that taking off and heading to the nearest furball is NOT a plan, and can get your country wiped off the map if you aren't extremely lucky.
I learned that there are never enough goons to go around (or panzers, or flak wagons, or M3's).
I learned that without those ground forces, you can have the greatest pilots in the air and still get nothing accomplished for your country.
I learned that, just when you begin to count on Roger Wilco, something will happen to prevent you from using it ("Roger Wilco cannot connect to IP xx.xx.xxx.xxx").
I learned that climbing to 20K in a P47 takes a loooooong time, and that you're a piss-poor glider when you get there, because you're out of fuel.
I learned that if you're not worried about scoring points, you are much more useful to your country.
I learned to be a bullet sponge.
Mostly, I learned that I have a LOT to learn