Warren Buffett Says This Is the 1 Mistake Many Investors Make. Here’s How to Avoid This Common and Costly Error.

Key Points Warren Buffett’s strong investing principles helped him drive gains at Berkshire Hathaway over time. The billionaire’s words of wisdom are particularly valuable in today’s uncertain market environment. 10 stocks we like better than S&P 500 Index › Warren Buffett propelled Berkshire Hathaway to six decades of market-beating returns, so it's no surprise that retail investors around the world look to him for advice. The billionaire aims to select quality companies when they're undervalued, then benefit over time as their earnings grow and the stock prices take off.