It's not always easy to be a long-term investor, particularly when contending with the natural cyclicality that the stock market presents if you buy and hold through bull as well as bear markets. Investing consistently during all types of market environments is key.

Investors don't have to make guesses about where to put their money in the stock market. Billionaire investors conduct careful research into every stock they buy, which is why it's worth checking out what they are buying (or selling).

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