Position is the most important and valuable advantage that you can have at the poker table.
If you are not familiar with the term, to have the position means that you are acting last (i.e. either you are the dealer, or the player who is to act after you have already fold). The worst positions are considered the blinds, since after the first betting round all players are to act after the blinds. Whatever your skill level, the situation, your cards, and the position (if you have it) will always give you more information during the game than any of your opponents. And in the world of Texas Hold’em the information is the most important thing.