I'm still finishing off the last two chapters, but the book and provided source code have been enormously helpful for learning much of the foundational ways in which computer games are made. At the end (mostly by chapter 7), you have a very extensible codebase for a 2d shoot-em-up style of game. The authors also make recommendations for further reading on topics that they didn't cover extensively since this is an introductory-level book (note: don't get carried away with an entity system if this is your first time making a game and you've never developed an application based on an entity system before).This book is for people who are comfortable with object-oriented programming in general and who have at least a basic grasp of programming in C++. The SFML wiki details the C++ features you should be comfortable with prior to using the library; I would strongly recommend reviewing the wiki before purchasing this book to make sure it is something that will be appropriate for you.The code written here is also cross-platform--I was able to compile and run the program on Linux, Windows, and Mac with only changes to the Makefile.One minor downside: the book is not written by native English speakers, and it could use a bit more review to clean up the language. This made it slightly less readable at times, but there was always sufficient context to understand what was going on, and it's definitely not enough of an issue to make me take a star off. If you can handle C++, the minor English errors will not be a problem for you.