So to add to the previous post.
Learning collective – https://techlearningcollective.com/contact/
Looks really interesting with regard to learning the command line, linux kernel stuff. Add to all the material at FreeCodeCamp – https://www.freecodecamp.org/ and there are a lot of options available to you.
As this project develops, hopefully people will be able to discuss what they find really useful on the forum which in turn helps others. This is the main purpose of this project.