Warren Buffet, the second richest man in the world who has donated $31 billion to charity, advocates for a simple lifestyle. He still lives in the modest house he purchased over 50 years ago and drives his own car without security. Buffet meets with the CEOs of his 63 companies only through annual letters, setting clear goals and trusting them to perform their roles. His advice is to invest in oneself, spend money on true needs rather than brands or unnecessary things, and find happiness by appreciating what you have.