As we develop a site and especially whenever we create or modify a file, whether that be the settings.php file, or as we begin to create themes or custom modules, we will frequently need to clear the cache. Often, it is not convenient to try to use the UI to perform such a task. In fact, we can use Drush to perform this task much more easily.

If we open a Terminal window and change to the /web directory, we can enter the following command to rebuild the cache:

    drush cr

We can see that Drush has rebuilt the cache, and if we keep a Terminal window open while we are developing, this is much quicker to perform.