This section describes third-party (non-Georgia Tech) modules that could be useful for your Drupal site. These are often referred to in Drupal documentation as "contrib" modules.
You should only install modules that you absolutely need, so that your site is easier to maintain and patch. If you decide not to use a module, be sure to disable it, then uninstall it (in Drupal 8, this is one and the same), and finally remove the module from your Drupal filesystem. Uninstalling is very important: if you don't uninstall a module before removing it, your Drupal site will throw lots of errors at you.
If you are not sure what a module will do or if it will be useful, install it to a test instance of Drupal first so that you don't accidentally mess up a good site.