Most poker players fall into one of four categories, and once you're experienced enough, you'll be able to place your opponents into particular groups very quickly. This is a detailed definition of the different types of poker players you'll find. As you play poker online you should try to pick up as much information about a player to accurately place them into a category.
But remember the boundaries of the different types of poker players are not clearly defined and the best pokers players can change their style of play very quickly to mislead the rest of the table.
A tight-passive player is one that won't raise or call unless they have a very strong hand. This type of player is normally best suited for limited Texas Holdem poker games and will very seldom take a risk on their hand. If a tight passive player calls your raise you'd better have the courage to backup your bet.
Loose passive players are also known as "calling stations". They call any bet you place and it's best to avoid bluffing these players. They'll very seldom fold once they've seen the flop.
These players will only bluff occasionally. They only play good hands and once they've got that hand they'll bet aggressively. Beware when this player raises he could end up taking a huge chunk out of your stack.
Some of the most famous poker players are loose and aggressive. These players have no problem going "all-in", but the best loose-aggressive players will mix up their aggressive and passive play, it's hard to read their hands. They go all-in with a pair of aces or just a simple 7, 3. These are the high-rollers of Texas Hold em poker.
Now all you need to do is begin by placing yourself in one of these categories, then go to the online casino and see if you can spot the different types of poker players and then play your strategy accordingly.