Do you play online because in real life you have tells that would give away your hand?
I play online because I can multi table, so I can " profit " more with that... And are just the tells that make me find the game fascinating.
But now talking about
online poker, if you haven't noticed when someone takes too long to 3bet you, especially if you know that the player has some experience, you might consider that he is thiking how he can
bluff you...
Usually beetween 30-50 Big blinds good regulars will eat you down in tables.
Other tell is how fast is someone calling you, if vilain instant call you, you can consider that he doesn't even think about a re-raise on the hand, and his hand is not that strong.
Here's what I have with my experience with tells, of course you can't take what I've said as a absolute true
but write it down the tells I've said in a paper and test your on.