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1 Investing Rule I Never Break

By Matt Frankel, CFP and Tyler Crowe – Jan 27, 2026 at 10:49AM EST

Here's what two of our analysts have learned from their own investing experience.

After investing for about 20 years (and making many mistakes along the way), I've developed a rulebook to prevent costly errors and let me stay invested while sleeping soundly at night. In this video, Fool.com analyst Tyler Crowe joins me to discuss some of our top investing rules that we use in our own portfolios.

*Stock prices used were the morning prices of Jan 22, 2026. The video was published on Jan 23, 2026.

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About the Author

Matt Frankel, CFP
Matt Frankel, CFP, is a contributing Motley Fool stock market analyst and personal finance expert covering financial stocks, REITs, SPACs, and personal finance. Prior to The Motley Fool, Matt taught high school and college mathematics. He holds a bachelor’s degree in physics from the University of South Carolina, a master’s degree in mathematics from Nova Southeastern University, and a graduate certificate in financial planning from Florida State University. He won a SABEW award for coverage of the 2017 Tax Cuts and Jobs Act. He is also regularly interviewed by Cheddar, The National Desk, and other TV networks and publications for his financial, stock market, and investing expertise.
TMFMattFrankel
X@MattFrankelCFP

Matt Frankel, CFP has no position in any of the stocks mentioned. Tyler Crowe has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Tesla. The Motley Fool has a disclosure policy.

Matthew Frankel is an affiliate of The Motley Fool and may be compensated for promoting its services. If you choose to subscribe through their link they will earn some extra money that supports their channel. Their opinions remain their own and are unaffected by The Motley Fool.

Stocks Mentioned

Tesla Stock Quote

Tesla

NASDAQ: TSLA
$433.88 (0.00%) $1.32

*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.

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