There's not a lot I know for certain.

Beyond the tying of shoelaces, there isn't much you can teach a person. But I believe every child should be given this little speech: “Whether they know it or not, everybody you meet is trying to make you more like themselves. Strong people tend to make you stronger. Weak people do things to weaken you. Drunks offer you drinks; whiners want you to whine back. Cruel people will be gratified if you respond to their cruelty with your own. Look for the kind, sad, funny people. They are the best. Try to learn for yourself how to be like them.”