A good business run by bad managers can be a recipe for disaster. Buffett looks for management teams that are competent and, crucially, honest.
Borrowing a metaphor from medieval castles, Buffett looks for companies with a "moat"—a defensive barrier that protects them from competition. 10 golden principles of warren buffett pdf verified
You can find these principles detailed in authoritative summaries and original letters: A good business run by bad managers can