Play on lower levels
Don't play with such bad cards
Don't bluff so much against loose players
Don't get upset when I give you my opinion after you asked me to discuss it with you.
Like my accounting teacher said to me after I came to him for help after I got 20% on my midterm: "I don't even know where to start with you."

Fnord is only being nice to you by saying "it's okay to do this and that when having fun..." because he wants to take your money.

Oh, and don't chase 4 outers on pot sized bets.