Upgrading is the process of moving your site from a previous major version of Drupal to a newer version, for example from Drupal 7 to Drupal 11.

Responsive web design is a set of design approaches and development best practices that ensures that a web design can be used on many types and sizes of devices.

Modules are bundles of primarily PHP code that extend Drupal in order to add new features or alter existing functionality.

Patches are used to describe modifications made to one or more code files, and can be used to share those changes.