Richard Feynman, the Nobel Prize-winning physicist, developed a remarkably effective learning method: explain a concept in simple language as if teaching a child, identify gaps in your understanding, return to the source material, and simplify again. This article breaks down the four-step Feynman Technique and shows how professionals can use it to master complex domains — from financial modeling to machine learning to regulatory frameworks. It also explores why simplicity is the ultimate sophistication in communication.