Common poker tells

Though poker tells are said to be popular, they are said to play a least role in the game. When you are playing a professional poker game, there wont be any poker tells to predict. Professional poker players are really smart enough to hide poker tells. These players, really don't  bother of the game but totally concentrate on the mathematical analysis. Poker tells are said to be important for beginners, especially while playing at beginner tables. Poker tells should be used properly, and predictions should be accurate, if players don't use them well, they would be losing games as well as pot money. Online poker tells are little bit difficult to use as well as implement, on internet you wont be seeing each other, so where would tells come from. Though players cant see others online, they can still chat or talk strangely. These strange ways can be predicted as poker tells, but they cannot be guaranteed to work out.