Know what you own, and know why you own it.

Investors
Peter Lynch
Peter Lynch ran Fidelity's Magellan Fund (1977-1990), averaging 29.2% annual returns and growing assets from $18M to $14B. His invest-in-what-you-know credo and tenbagger concept became mantras for retail investors.
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Peter Lynch's Other Quotes
Far more money has been lost by investors preparing for corrections, or trying to anticipate corrections, than has been lost in corrections themselves.
Invest in what you know.
In this business, if you're good, you're right six times out of ten. You're never going to be right nine times out of ten.
The key to making money in stocks is not to get scared out of them.
Go for a business that any idiot can run - because sooner or later, any idiot probably is going to run it.
Related Quotes
Invest in what you know.
-- Peter Lynch
You can't predict. You can prepare.
-- Howard Marks
The most important thing is being attentive to cycles.
-- Howard Marks
The most important investment decision you will make is how to allocate your assets.
-- David F. Swensen
Investors should pay attention to what they own, not simply to the overall return of their portfolio.
-- David F. Swensen
It's not whether you're right or wrong that's important, but how much money you make when you're right and how much you lose when you're wrong.
-- George Soros