Drupal 8 documentation
Community documentation for Drupal 8: general Drupal topics, contributed projects documentation.
Drupal 8 User Guide
Curated introduction to readers new to Drupal 8.
Developer documentation
Documentation for developers about tools, processes, and standards that is not specific to a major version of Drupal.
Drupal 7 documentation
Community documentation for Drupal 7: general Drupal topics, contributed projects documentation.
The Drupal.org Community Documentation is maintained by the Drupal community. Find out how you can help.
Developer Guides
Search the complete Drupal API including forms, menus, node access, theme system, etc.
Use git for version control to manage projects and code, and to colloborate with other Drupal developers.
Examine a standard repository of sample modules that can be used to learn module development, or are referenced on handbook pages.
Other Information
Reuse chunks of Drupal code that people have shared with the community.
Identify and solve problems with servers, page display, permissions, logins, etc.
Drupal Books
There are many useful books about Drupal. Here are just a few of our recommendations: