1. Look for a good move then find a better one.
2. Ask the question, am I leaving a piece hanging?
3. When making a move, try to figure what possible options your opponent will respond with.
4. Try to anticpate what your opponents game plan is before you make your move.
5. Try to plan 4 or 5 moves ahead. Really great players plan many more than that.
Don't bring your queen out early without a good reason. You'll waste time moving it to safety while your opponent continues developing his pieces and gaining space.
Very true. I notice that the most with new players. You need to have a good reason to move the queen out.
Don't shoot your opponent if he puts you in check!
P.S. this is excused if he puts you in mate
do what dalton says..... be nice !
i want you to be nice !
Don't make a move untill you have examined EVERY SINGLE MOVE OR CAPTURE.
Don't get checkmated. 
Don't run when you're holding scissors and playing chess
or else you could cut the king in half and give up
Don't play on and on with games you know are lost.
But don't resign 'til you know how your opponent's going to win!
Don't shoot your opponent if he puts you in check!
P.S. this is excused if he puts you in mate
I love it!!!! (lol)
Do not throw your Queen at your opponent !!
Don't play chess in a burning building.
Don't play lazy moves without thinking just because your opponent is 500 points lower; don't defend passively or attack recklessly just because your opponent is 500 points higher. Don't keep looking for the mating attack that isn't there, just because you feel you should beat a player because of his rating.
Play the position, not the player, and definitely not his rating.
Don't ever neglect your girlfriend or wife because of chess.
Oh man, if i had only heard that years ago......
Don't play chess in a burning building.
or else the bottom of the king could melt and fall over so you could then for fit the game
Do not throw your Queen at your opponent !!
Pity we can't do this in chess.com!.... yet.
Protect the king...