Think of it as a comprehensive means of exercise. Not sure if you go to the gym, but comprehensive exercises train most of the body; and this book covers most parts of the skill. However, this kind of training will not refine and isolate areas that need further development, for that you'd need to learn from additional sources.
There are
tutorials,
guides, examples at
DBPRO corner and
Codebase; also additional books on computer science and trigonometry.
When looking at a tutorial, book, example code or any advice whatsoever; always, always check the history of the author; what does this person do? How long have they been doing it? What have they achieved? How effective is their use of language? Avoid guys who use the phrases 'I think this should work', 'This should always be done this way' fullstop; without explaining WHY. These people tend to be bad examples and often bad teachers and have plenty of time to waste your time.
Always ask questions if you are not sure about anything, however small or big; you can save yourself time, 100 minds are more effective at solving a problem than one, so share it.