I've only been playing the game for a short time, but my thoughts are:
(in no particular order)
1. Twisting banks. For example, widening the angle of a short rail bank with outside English to come just above the stack for position on balls that go to your pocket, and if you hang the ball up your opponent can't see it. This is very hard to do if you shoot it with no English.
2. Pocket speed banks. If you manage to hide the cue ball they can be better than making a ball.
3. This might not be as important as I think it is as a new player, but banking a ball to your side and burying your opponent in the stack is a very important shot in my opinion.
EDIT: And a fourth, because I can
- short rail cross banks. From anywhere, and I mean ANYWHERE, above the side pocket.