Principles are widely recommended and are currently in the top 10 Amazon sellers in the following categories: Business & Organizational Learning, Decision Making & Problem Solving, Business Management. Speaking more about Ray Dalio, he is not an author who gets rich from book selling (oh, I have a bias against people who write books to get rich, open enrichment courses but get rich from books and courses … ). Ray Dalio is a self-made billionaire, a tycoon in the financial investment world and founder, running one of the hedge funds (hedge fund) the world’s largest today. The principles he wrote in the book were drawn from his own life, a life that went through many ups and downs and challenges and through reflection and constant improvement and change, and then Ray Dalio shared. what he learned in this 600-page book.