1. never go more than 30 blocks deep in water.
2. never look an enderman in the eye.
3. don't mine strait up.
4.don't go deep in a cave without marking where you've been.
5. never ever fight the ender dragon without diamond everything.                                               
6.never make a structure 50 blocks high and jump off.
7.never beat the creator in a server.
8.dont walk around at night on hard.
9.don't wander off to far from home.
10.do not kill a zombie unless you want every other zombie in the game to try to attack you.