I Analyzed 1,377 Investment Rules from 26 Legendary Investors — Here Are the Patterns I Found

As a developer who built keeprule.com , I spent months digitizing investment wisdom from Buffett, Munger, Dalio, Marks, and 22 other legendary investors. After cataloging 1,377 individual investment rules, I started seeing patterns that surprised me — and they map remarkably well to concepts we already understand as developers. Here are the 5 biggest patterns I found. Pattern 1: The "Circle of Competence" Is Just Scope Management 23 out of 26 investors have explicit rules about staying within your area of knowledge. Warren Buffett calls it the "Circle of Competence." Charlie Munger says you need to know "the edge of your own competency." Peter Lynch says "invest in what you know." As developers, we already understand this instinctively: // The Circle of Competence, translated to code function shouldInvest ( opportunity ) { if ( ! myCompetence . includes ( opportunity . industry )) { return false ; // Stay in your lane } return analyze ( opportunity ); } You wouldn't deploy code you hav