Warren Buffett, the billionaire chairman and CEO of Berkshire Hathaway, has two core principles regarding money management. Rule No. 1 is 'Never Lose Money.' This principle emphasizes the importance of caution and knowledge in investing and financial strategies to minimize the risk of loss. Rule No. 2 is 'Never Forget Rule No. 1.' This rule stresses the importance of permanently preserving wealth at the forefront of financial decisions.