Position

The importance of position can't be understated. Remember that if you're first to act everyone knows how to respond to you. Conversely if you act last you can react to everyone else. This is a huge HUGE advantage. The difference is that you can play K8 as the dealer to better efficiency than if you were to play A8 if you were left of the dealer. The difference is huge. Whenever you play A8 you'd play blind and not really know if someone has you outkicked. But if you were last as K8 you can see how people bet first to know if you should fold, or re-raise. You can even try to steal the blind. You just have more options when you act last. So remember these things:

1.) The earlier you are to act the tighter you should play
2.) If you're last to act take advantage of your situation and observe what is going on in the hand.