Warren Buffett has generated tremendous gains for the long-term shareholders of Berkshire Hathaway over the years. The legendary investor's buy-and-hold style has also inspired countless investors to attempt to follow his strategy. There's no better way to learn how to do it yourself than to pay attention to the stocks that the conglomerate buys and sells.The Berkshire Hathaway portfolio today features stakes in more than three dozen companies that were either selected by Buffett himself or one of his inves ...