Shinobi world (or ninja world) is a term used to describe the universe in which Japanese ninjas operate. This world has been popularized in culture through books, comics, movies, and games. If you are interested in the world of shinobi, you can read literature on this topic, such as "The Book of Five Rings" by Miyazaki Ninjutsu, "Naruto" by Masashi Kishimoto, "Hidokido: Knowledge and Martial Arts of the Ninja" by Tomoyasu Hirokawa. You can also learn about the world of shinobi by visiting websites dedicated to the subject and talking to people who study Japanese martial arts. The best way to master the world of shinobi is to study ninjutsu itself, which is a comprehensive set of techniques and philosophies that will help you become a ninja.