The most taboo thing for learning any science knowledge is to cram various academic jargon and formulas, that's why almost any school textbooks with text-heavy approach always make us feel drowsy! Because when explaining those obscure and complicated knowledge points, they are not clear and readable enough to make us understand and absorb these knowledge points with ease and efficiency.

Krav Maga (קרב מגע‎, pronounced as [krɑ:v, mə'ɡɑ:], means "contact combat", AKA: Israeli Combat System) is a military unarmed combat/self-defense system originating in Israel, and originally specially developed for the Israel Defense Forces (IDF) and Israeli Security Forces (Shin Bet and Mossad), its originator is Imi Lichtenfeld (AKA: Sde-Or). It is a required course for the Israel Defense Forces and all personnels work on military and law-enforcing departments. Now, in addition to being widely imparted to various law enforcement officers around the world, it also has become a very popular and efficient self-defense art for civil use.

Unity Game Development in 24 Hours, Second Edition may be currently the best tutorial book written for absolute beginners to the Unity game engine who want to learn it from scratch and step by step.

Linux is cool not just because it's free and open-source, more often than not, that's because it's so powerful. For example, it is used to build large servers with high performance and high stability; to make the old computers bloom; as desktop or office operating system for individual users or enterprise users, and more. I think any users who are interested in computers, somewhat get tired of Windows, and want to try some new OS, they may want to begin to reach the mysterious Linux operating system. But if you want to make learning Linux easy, you really need a good book for the level of beginners.

Unity 5 from Zero to Proficiency is a series of Unity tutorial books specially written for absolute game developing beginners. This step-by-step and easy-to-understand, easy-to-follow series of handbooks for Unity 5 can take readers from game developing yearners who know nothing about Unity (even the game programming itself) to a professional game developer with good level of proficiency to Unity.