If people do wrong thing, pretend you don't see it. Don't go find fault with people, later, they might bully you in return.
and if can, close your ears, don't listen to gossip. Don't listen to things that is not nice to listen to."
Then, only would you be able to find good friends.
I don't really listen to her advice, but this time, I think I'd be following it. I remember how she used to tell me this every day when I transferred from KL to Ipoh in the middle of Form 1.