"Definitive" is quite a claim to make. Not everyone who works in Drupal is good at all of it, or even can know about all of it. Which is fantastic news for us, the readers and users of this book.
No one expert in all areas, and so there are many onramps and avenues to becoming a Drupal expert. This multi-author book gives many of these at the same time as providing an essential overview. Together, we will learn how to think about and approach Drupal 7 and future releases.
This book tries to teach readers how to think about Drupal and how to get involved in the community.