This is the best bit of poker advice you will ever hear:
Position is everything!
Having position means you are last to act.
The reason position is so important is because position gives you information. If you are first to act you have no information. However, if you are last to act – you get to see what everyone else has done and you can make your decisions based on those actions.
Poker is a game of information. The more information you have – the better the chance you have of winning. In position you have the most information.
This means you should play a lot more hands from late position than from early position. Your profits should increase from first position (UTG) to the button. All top players make most of their money on the button, slightly less in cut off seat (the seat to the right of the button) and less and less all the way till first position.