Building wealth is often viewed as a game of finding the perfect investment, the next big opportunity, or a secret financial shortcut. But Charlie Munger, the late vice-chairman of Berkshire Hathaway, believed the real path to long-term wealth was much simpler, avoiding the mistakes that quietly destroy financial progress. For decades, Munger studied human behavior, investing, and decision-making. His biggest lesson was not just about what people should do to become wealthy, but what they should refuse to do.