These professional investors are finding value in China, energy, and video games.Following billionaires for investment ideas can help you avoid a lot of mistakes. These professionals usually have a long career of picking stocks that beat the market's average return, and importantly, they have access to resources to assist in their research that individual investors don't have.David Tepper of Appaloosa Management, CEO Warren Buffett at Berkshire Hathaway, and Chase Coleman of Tiger Global Management all have ...