The two main styles in poker are loose and tight. Depending on the betting style, a player can be passive or aggressive. The aggressive player raises and re-raises very often. A very aggressive style is appropriate if you play with a player who is ready to fold when you raise even when his cards are better than yours. A moderate aggressiveness is good always when you play tight. If most of the players are passive, the lack of aggressiveness will lead you to less profit, nothing more! Your playing style with aggressive players should be tight but you should call only if you have strong hands. In this case, you can raise and re-raise and don’t worry that other players will fold. A good strategy against aggressive, frequently bluffing players is to fold not very strong hands when they raise, making them believe that their raises are substantial and this way making them play even more aggressively with not that strong hands.