What are the key takeaways from “I'm 80 and I wasted 25 years of my life. Don't make my mistake. - Howard Marks” on My First Million?

What is this episode about?

Howard Marks argues that true investment superiority requires 'second-level thinking' and the humility to acknowledge that one could be wrong. He explains that the most dangerous investor is the one who is 100% convinced, noting that great decisions are often made despite significant trepidation rather than in its absence.