The following video is part of our "Motley Fool Conversations" series, in which analyst Rex Moore discusses topics across the investing world. In this series on the psychology of investing, you've learned how anchoring may have hurt Netflix (Nasdaq: NFLX) and Apple (Nasdaq: AAPL) investors, and how confirmation bias kept many from missing Amazon.com's great run-up.

Today, Rex and Buck Hartzell wrap up the series with tips on how to avoid some very costly mistakes. See the entire series:

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.