Configuring settings.local.php

We are all familiar with Drupal's settings.php file. However, in Drupal 8, we can now have different configurations per environment by creating a settings.local.php file that the default settings.php file can reference. This is the first step in allowing us to enable Twig debugging:

1. First, we will need to copy example.settings.local.php, located in the /sites folder, to the /sites/default folder and rename the file to settings.local.php.
2. Next, we need to open settings.php, located in the /sites/default folder, and uncomment the following lines:

       if (file_exists(__DIR__ . '/settings.local.php')) 
       { include __DIR__ . '/settings.local.php'; }  

3. Save the changes to our settings.php file.;

With our change in place, we will need to make sure to clear Drupal's cache before our changes will take effect. Now that we have a local settings file in place, we can make a few more configuration changes that will allow us to not worry about always clearing the cache...