Every investor has stars and duds in their portfolios. Even Warren Buffett is in the group. The good news is, in Buffett's own words, "Over time, it takes just a few winners to work wonders."

Still, it certainly helps to boost your returns if you gravitate toward the stars and stay away from the duds. This applies to stocks in Buffett's Berkshire Hathaway portfolio, too. Here are two Buffett stocks to buy hand over fist and one to avoid.

If I had to pick the most impressive company Buffett owns a stake in, it would probably be Amazon (NASDAQ: AMZN). The company has transformed how we shop and how businesses handle technology.

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Source Fool.com