Although Buffett said that Bitcoin is the square of rat poison, it seems that his ideas still have many lessons for holders in the cryptocurrency industry to learn from: 1. Emotional management: If you can't control your emotions, you can't control your money 2. Longtermism: Our holding period is forever 3. Safety margin: The first rule of investment is not to lose money 4. Reverse thinking: Greed when the market is fearful, fear when greedy 5. Ability circle: Only invest in industries or companies that one understands 6. Moat: selecting enterprises with lasting competitive advantages 7. Compound interest: Enjoy exponential growth brought by time