You're most welcome.
Thank you a lot for taking the time to write this topic, it may not seem much from outside, but comments like yours are a huge help on keeping a project like this alive.
If you find something's missing or there is any subject you want to see included in the book, by all means feel free to make a suggestion! I'll make sure to include it in the book.
In the meantime, I hope this book is being of use to you, either for starting up in the subject of game development, or just to study for your own personal knowledge.