Since I still relatively new (only about a year in the hobby) I'll give this a shot

1.) What is a crystal?
2.) What does 4ch, 6ch etc. mean?
3.) What percentage fuel should I use?
4.) Can you use the same transmitter for different planes?
5.) How do I know when my glow driver battery is dead?
6.) How do I know when I'm ready to move on to my second plane?
7.) What's a "buddy box"
8.) Should I use an electric fuel pump or a hand crank?
9.) How do I balance my plane?
10.) How do I balance a prop?
11.) What's a "spinner"