All right then. Don't turn blue. Don't touch people if you do turn blue. Don't set things on fire. Don't invade people's minds. Don't stab humans; they're frightfully delicate. Don't cast any illusions that cause someone to walk in front of an oncoming car. Etc., etc., etc.
You can come to my house for proper lessons since you clearly didn't put as much effort into your magical education as you did learning to talk to sentient trees.