The whole open source eco-system has similar things e.g. Drupal books and so-so online documentation (I can attest to this one), Joomla, WP …. Books are much li

The whole open source eco-system has similar things e.g. Drupal books and so-so online documentation (I can attest to this one), Joomla, WP …. Books are much like doing workshops, they're a shortcut for those who are prepared to pay rather than have to do a lot of online searching.