Know Your Opponent; Own Your Opponent

Here is another I just got today....Lesson from the Pro's..

was at my first World Series of Poker in 2002, talking to a player who had made the final table the year before. He told me something I've never forgotten, and it's helped me ever since.
I had raised pre-flop with A-K and he called from the button. The flop came all small cards. I checked and he fired a pot-sized bet. I looked at him and said, "You must have a good hand." His reply caught me off guard; "It doesn't matter what cards I have if I know what cards you have."

At first I thought I might have a tell – maybe I hummed when I missed the flop, or I looked away from my chips. It was later that I realized I did have a tell, but it had nothing to do with my physical demeanor. It was the way I played my cards.

Poker is often not so much about the cards you have, but knowing the way your opponent plays. Keeping track of which hands your opponent raises with - and the position from which he raises with them - is a large part of the game.

In a live game, it is hard to remember exactly what cards your opponent has raised with over the years and, if they're good players, those hands will change from time to time. But many poker players are creatures of habit, playing the style they are most familiar with. Online, there is no excuse not to have this knowledge at your fingertips.

Thanks for the info. That is gonna be quite useful for me, as I've always had a problem with concealing my emotions. Whenever I get a good hand, I start humming with joy or, if I don't, eveything is written right all over my face anyway.
That's why I prefer to play poker online: there's no way people can learn your face expression ))) Still, there must be quite a number of online tells. Can you please give me a couple of examples? I just can't guess how people still figure me out