My session done at DrupalCamp Montreal 2018 about a high speed workflow for Drupal 7 and 8 with Composer, NPM and Lando.
So you want to edit a specific piece of code provided by a class from Drupal's core or from a contrib module?
Menus are very specials in Drupal 8 - and sometimes very frustrated too!
Learn how to filter menu items by the current user's language in Drupal 8.
Me in a few words.