Renowned investors including Guy Spier, Rob Arnott, Michael Mauboussin, Steve Romick, Joel Tillinghast, Cem Karsan, Bob Ellott, and Jerry Parker share their most important investing lessons. Topics covered include self-forgiveness, action, and diversification, the importance of knowledge and flexibility, avoiding natural investing mistakes, analyzing the truth and geopolitics, investing in real opportunities, thorough homework and independent research, the significance of rebalancing, finding your investing philosophy, understanding the importance of perspective, the importance of price confirmation and having an open mind, maximizing contributions to retirement accounts, and teaching children about investing.