Charlie Munger once talked about Warren Buffett's '20-slot' rule on successful investing. Here's how it works.

"Under those rules, you'd really think carefully about what you did and you'd be forced to load up on what you'd really thought about."

https://markets.businessinsider.com/news/stocks/warren-buffett-investing-strategy-charlie-munger-20-slot-rule-berkshire-2023-11