Your table image is also very important. Build a strong table image by not bluffing early in your play. Bluffing early marks you as a bluffer and people will call your bluff 100% of the time. Play good cards and throw away junk cards, have the other players at the table see you are only playing strong hands. This sets up the opportunity for you to use a good bluff later in the game as you have conditioned the others players into thinking that when you raise you have the cards to win the hand.
Studying other players and their betting behavior is equally as important. It is too easy to get wrapped up in your own game and miss the “tells” the other players may be exhibiting. Knowing if they bet aggressively or typically call with a strong hand empowers you and your betting decisions.
Most important of all is know when to quit! You should always be sharp and focused when at the betting table. Fatigue leads to mental errors and ends up costing you money. Frustration is another sign that you are ready to call it a night, or at least take a break. Play smart and you will win smart.