Ok but I'm cought too often, so how to know when you can bluff? Is aggresion depends on on balance of bets& checks?
I think it comes from how the other players see how you play, being aggressive and pushy from early stages can be dangerous play, if you all have the same chip-stacks, but if you give the early impression that you are a tight player, and are waiting for the monster
hands before playing a hand, they will show you some respect when you do enter pots.
I have and still do, fold the majority of hands in early stages, just to show I am a tight/sensible player, then when I do start to be a little aggressive with raises and re-raises, they begin to suspect I may have some monster hands and back off a little, this then can give you the opportunity to try a few bluffs in later stages.
To bluff or try to bluff in early stages can be a dangerous play, as they have no perception on how good/bad a player you are, and if caught out in the early stages they will label you as a bluff player, and will call you even if they only have top pair.
It takes time and practice to become good at anything, so try a little patience before pulling off the perfect bluff, and good luck in the future.
When the fun Stops, STOP!