The simplest durable lesson here is this: a good outcome does not automatically validate a good process. Three quick checks before you act: 1. Name the mechanism in plain English: Markets occasionally reward sloppy reasoning. That is exactly why investors need post-trade review standards that do not depend only on P&L. 2. Say why it matters for behavior or portfolio decisions: If you only learn from outcome, luck gets promoted and discipline gets demoted. 3. Set the review question: On the next review, write down the one variable that would make you change your mind. In real life: A rushed trade that works once can be more dangerous to your process than a thoughtful trade that loses within plan. Common slip: The mistake is using profit as the only teacher. That is the kind of small conceptual habit that compounds into better decisions over time.