Do not cross your legs; stay in a fighting stance as you shuffle.
Do not dance on the backs of your heels - stay light on your toes. It hides your intended movements from your opponent.
Keep your eyes open.
Do not lock out your arm as you punch, it may lead to elbow injuries.
For any technique that is not a fake, any movement, offensive or defensive, that is not toward the target is wasted movement, which makes the technique slower than that of a direct movement toward the target.
Point your feet in the direction of the power.
Some prefer to not look at the scores and just fight their best fight, but the scores are important to your fighting style. If you are ahead and time is running out, you may want to use a defensive strategy. If you are behind, you may want to go for higher scoring techniques
Do not stick out your tongue or mouth guard. Do not chew your mouth guard.