When you are playing poker, especially if your playing online, one of the most important rules is to remember is to stay patient. Playing too many hands whether through inexperience or just plain boredom, then you will always lose money. Being patient and looking at your poker in the long term, you can profit at the tables.
If you watch a live tournament on television, you will see how few hands are actually played, the pros know its about patience and consistantly picking the right moment. It can be a tedious playing when your not getting the cards, but use this time to study your opponents, there is always something you can pick up on that will help you beat them.