1. Pause on the river – that usually means strength. If a player pauses on the river and then bets or raises, they usually have the goods. It’s the online version of “Hollywood”.
2. Quick raise – this move usually means weakness. The player sets the auto-raise to make it look like they’re strong. This is often a bluff.
3. “I have to leave” – when a player writes they have to leave and goes all-in, they often have pocket Aces and are looking for action from medium strength hands.
4. Delayed check – this player is trying to get a free card by trying to appear strong, like they’re taking time to set a trap for you. They usually have a weak drawing hand.
5. Delayed bet – this move is usually a sign of strength. The player is attempting to appear like it’s a tough decision whether to bet out or not.

I’ll leave you with an informative Poker Tells video from stonecoldbluff.co.uk. Enjoy.