I would have to say the best rule to live by. NEVER PLAY ON TILT. if you lose a monster pot or had a hand you knew you were beat but had to call just cause MOVE on and play as though you just sat down.

The second one i would have to say is. If your not in the hand keep your mouth shut lol. This has been the cause of big fights your comments can change the way someone plays a hand thus costing them or someone else in the hand money. Just imagine it was you in the hand and someone at the table points out three to a flush that another player didnt see and the player winds up folding costing you money on your continuation bet ya know