I loved the convenience of the book, you learn things but mostly we learn to practice them.
There is no mystery to advance in this field must necessarily training. Imagine just reading the statements of school exercises; it would have little interest!
Note that the author is very responsive via email to answer questions, this closeness with him is a real plus that I have not seen anywhere else and I wanted to highlight. For that alone: Mr Bussa :-) thank you!