In this tutorial, I am going to show you how to Enable Twig debugging options in Drupal 8.

To enable twig debugging
1. Go to sites/default/services.yml file
2. Look for services.yml  if it doesn't exist then copy it & rename to services.yml
3. Open the services.yml file in the editor and change the default value of debugging options.

Default Value of debugging options Under twig.config section:

parameters:
  twig.config:

    debug: false
    auto_reload: null
    cache: true

Value of debugging options after Changing:

parameters:
  twig.config:

    debug: true
    auto_reload: true
    cache: false

debug: Set debug to True will Enable various debugging features in the Twig engine like filename suggestions.

auto_reload: Twig templates will automatically recompile when their source code changes by setting auto_reload to true.

cache: Set to false will Disable Twig Cache.