Play according to your position

1) Poisition control generally means be the one betting not the one calling. Aggression is a key ingredient in winning poker players.
2) Position  The later a player acts after the Flop the better; other players actions will be seen before you have to decide on yours.
3) Starting hands - The hands you play depend upon the above 2 factors.

The best scenario pre Flop is betting with AA on the Button - probably the worst scenario is calling with A 3 from the Big Blind.