Drupal core structure

In Drupal, we have several locations where our contrib and custom code go. The following figure illustrates the directory and file structure for Drupal 8.x core:

All custom and contrib items need to go into either modules, profiles, or themes.

The recommended structure inside these directories to add the contrib and custom directories. Consider the following examples:

• Modules:
  • /modules/contrib
  • /modules/custom
• Profiles:
  • /profiles/contrib
  • /profiles/custom
• Themes:
  • /themes/contrib
  • /themes/custom

There are other key directories here that don't need to be touched, but there is also a sites directory, which contains our sites configuration to access the database, files storage, libraries, and services.