[Machine Translation] The skills, tactics, and physical strength of world-class volleyball players are developed during the junior and youth years. However, no matter how hard we try to coach players during this period, if the coaching is not backed by solid theory, it may hinder their progress, and sometimes they may learn the wrong skills. In this sense, coaching must be pursued on a scientific basis, rather than relying solely on experience. This book is a coaching bible for the new era, systematically summarizing coaching theory, the science of development and growth, basic techniques and their teaching methods, systems and tactics, and game management necessary for coaching volleyball.