LAG= Loose Aggressive- plays a lot of hands both raised and unraised, you never really know what they are going to show up with. This is a very difficult style to pull off effectively but it can be very profitable.

TAG= Tight Aggressive. What should should hope to play like.

Nit= Tight passive. Plays few hands and folds basically unless they have a very good hand or the nuts.

Calling Station= Loose passive. Plays a lot of hands and will call usually when they hit any piece of the flop. Dont be one of these, although they can be difficult to play against because they don't raise when they have a good hand. Don't bluff these people.

That should be enough to get you started.