One piece of advice he’s not sure people will follow, however, is his signature strategy: value investing. It’s a practice that takes time and patience—but pays off. Buffett’s current net worth is about $150 billion, and Berkshire Hathaway’s current market capitalization is a whopping $1 trillion. (Along with Saudi Aramco, it is the only company in the world with a $1 trillion-plus valuation that is not a tech firm.)

Value investing involves searching for companies trading below their intrinsic value and prefers quality businesses with strong growth…