A good outcome does not automatically validate a good process. Core idea: Markets occasionally reward sloppy reasoning. That is exactly why investors need post-trade review standards that do not depend only on P&L. Why it matters: If you only learn from outcome, luck gets promoted and discipline gets demoted. 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. Try this: If you had to teach this without jargon, what would you tell someone to monitor first? The point is not to memorize the label. The point is to know what variable is actually doing the work.