Drupal API documentation
Discover hundreds more Drupal tutorial videos at Drupalize.Me/Videos.
In this video you'll learn how to use api.drupal.org the canonical source for information about Drupal's hooks, APIs, and code documentation in order to find out information about implementing a particular hook, making use of a particular function or library of functions, and even gaining a better understanding of some of the big picture concepts behind Drupal's code and APIs.