Go for a business that any idiot can run - because sooner or later, any idiot probably is going to run 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
Invest in what you know.
Know what you own, and know why you own it.
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.
Far more money has been lost by investors preparing for corrections, or trying to anticipate corrections, than has been lost in corrections themselves.