Most of the time the people who bluff and end up wining know exactly how to carry themselves, the game is about trying to deceive and confuse your opponents so that they may think wrongly about your motives.
Bluffing is the key of winning in poker games. If you are a good and experienced bluffer you will definitely win the game. Make sure that your opponent is not good bluffer than you, otherwise he can give you tough time in the game and my win all your money. Always play with less experienced bluffer in poker games, so that You will always be in profit.
Are you sure that bluffing is the only key of winning in poker games? Bluffing is just a strategy, there is no guarantee that you'll always win by bluffing. Even a poker pro player may still lose when he/she use bluff, or even a pro players getting bluffed by a beginner. So I have to disagree that bluff is the key of winning in poker games.
This is just a strategy to make the opponenst distracted and make them feel we are at comfortable position to win that game but it involves risk because we knows that we don't have cards for winning but still making the opponents to give up but if they knows that they are having better pairs then no one can stop us from losing the bets.