How to use Hooks for building Drupal 8 themes
Hook42 Team, Jan 31, 2020
https://www.hook42.com/blog/how-use-hooks-building-drupal-8-themes
An overview and examples of theme preprocess function hooks.
New to Drupal: Improved Dumping of Twig Variables!
M. Herchel, herchel.com, Sep 1, 2022
https://herchel.com/articles/new-drupal-improved-dumping-twig-variables