The simplest and most effective rule is the third one: use discipline to control your hands—don’t rely on feelings. If you’re down 3%, exit unconditionally. If you’re up 6%, lock in half first; never add to positions when you’re in floating loss. Write all the rules on paper—when the market comes, just execute, don’t think. Emotion is the most expensive thing in trading—those mechanical, boring days are actually when your account grows the fastest.