I just released all my #Drupal #training materials under the CC-BY 4.0 License. https://learn-drupal.jpoesen.com/ Core content management and site building, basics of development including working with VSCode, DDEV, Drush, the Linux command-line, Twig 3, and Object Oriented PHP. 40-ish guides with annotated screenshots and plenty of activities for yourself or your students. May they be of use to someone.