Pharo is a modern, dynamically-typed, reflective, and pure object-oriented programming language. It offers strong productivity via a fully live programming environment. It supports Xtreme TDD, a powerful development technique that puts live objects at the center of the coding experience. More information at http: //www.pharo.org. Pharoers are used to say that programmers will never program the same once they coded seriously in Pharo. Learning Pharo is easy. Software developers learn Pharo in a couple of days. In addition, you can follow an excellent online free lecture available at: http: //mooc.pharo.org. This book covers all the key aspects of Pharo: its syntax and its core libraries such as collections and streams. It also takes the user over simple tutorials that present all the aspects of code development with tests and git management with Pharo. In addition, it presents advanced topics such as reflective facilities and meta-level.