Editor of choice - Vim

1. https://vim-adventures.com/ - Help you to understand how Vim works, the basics. So you won't abandon it after 10 seconds...
2. http://www.vimgenius.com/ - Practice...
3. https://danielmiessler.com/study/vim/ - Practice...
4. http://vim.wikia.com/wiki/Best_Vim_Tips - When you have no way back...

Ruby

1. https://www.codecademy.com/learn/learn-ruby - Pick up the basics.
2. https://www.sololearn.com/ - Pick up the basics.
3. https://learn.co/tracks/bootcamp-prep - Pick up the basics.
4. https://medium.freecodecamp.org/learning-ruby-from-zero-to-hero-90ad4eecc82d - Inspiration.
5. https://learnrubythehardway.org/book/ - The foundation.
6. https://www.learnrubyonline.org/ - The foundation.
7. https://www.ruby-lang.org/en/documentation/quickstart/ - The foundation.
8. https://exercism.io/ - Practice with mentors.
9. https://www.codewithjason.com/ - "I Know I Should Be Writing Tests But I Don’t Know How To Start"

Rails

1. http://www.pragtob.info/rails-beginner-cheatsheet/#ruby - The cheat sheet.
2. https://betterexplained.com/articles/starting-ruby-on-rails-what-i-wish-i-knew/ - Inspiration.
3. https://www.railstutorial.org/book - Build it to and extend it. A simple twitter app.
4. https://guides.rubyonrails.org/getting_started.html - The foundation.
5. https://pragprog.com/book/rails5/agile-web-development-with-rails-5 - The book.