How many times in Drupal 7 do you find yourself looking up the naming conventions for page or node templates? In Drupal 8 they've also added the ability to create templates per field! Yes, you can go to Google, run a search and start reading through the results, or you can enable Twig Debugging.First and foremost this is not the devel module. There isn't an external module to install either. In the sites/default/ directory you want to locate the "default.services.yml" file, duplicate it and rename to "services.yml". Within the newly created services file you want to paste the following...