P 500 by about 3.3% per year, and even over 20 years they lagged by roughly 1.1% per year. We break down the 10 most common mistakes—from panic-selling and market timing to performance chasing, poor diversification, and treating investing like entertainment. Then we lay out an “advisor-like” improvement plan you can implement immediately: a one-page investing rulebook, automation, and a simple rebalancing system designed to keep emotions from hijacking results. We wrap with practical guidance for listeners who decide they want professional help, including what to look for in a fiduciary CFP® at a Registered Investment Advisor.