Most traders who fail do not fail because their analysis was wrong. They fail because their risk management was nonexistent. This fourth volume of the Must Know Trading Terms series is the shortest in the series — and arguably the most important. Across fourteen short chapters, Personal Trading Coach walks you through the concepts that separate traders who survive from traders who blow up: how to size a position so a single bad trade can't ruin you, what expectancy is and why it matters more than win rate, how drawdowns work and why recovery math is brutally asymmetric, what risk of ruin means, and why a trading journal is the highest-leverage habit you can develop. The approach is friend-to-friend rather than instructor-to-student. Each term gets a clear definition, a worked example, common mistakes to avoid, and a wider perspective. Practical visual diagrams illustrate the most important calculations. If you only read one volume in the series, read this one. The strategies in Volume 3 only matter if you're still in the game next year — and the concepts in this volume are what keep you in the game. For educational purposes only. Not financial advice.