"Be prepared, work hard, and hope for a little luck. Recognize that the harder you work and the better prepared you are, the more luck you might have." -- Ed Bradley

Those words of wisdom apply to many aspects of life, such as sports and your career. They apply very much to investing as well. If you work hard -- perhaps by reading widely -- you can become a savvy investor, able to spot red flags and green flags in financial statements and identify high-quality, growing companies.

Ideally, though, you don't want to invest in those companies at just any price. Instead, aim to buy when they're undervalued -- say, after a market pullback -- thus giving you a margin of safety. Below are three such contenders to consider. If you like any of them, add them to a watch list and wait for a better price.

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Source Fool.com