commands/help/topics/ruby.txt
See these links/courses for learning Ruby:
Official Ruby Core 2.4.1 Documentation
<http://ruby-doc.org/core-2.4.1/>
Quickstart Guide: Ruby In Twenty Minutes
<https://www.ruby-lang.org/en/documentation/quickstart/>
Cheatsheet/Reference:
<http://www.cheat-sheets.org/saved-copy/RubyCheat.pdf>
Learn to Program with Ruby
<https://pine.fm/LearnToProgram/>
Free (Language Transition): Ruby From Other Languages
<https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/>
Free (Exercise Focused): Learn Ruby the Hard Way
<https://learnrubythehardway.org/book/>
Free (Exercise Focused): Codecademy Ruby
<https://www.codecademy.com/learn/ruby>
Free (Ruby on Rails 5) : Ruby on Rails Tutorial
<https://www.railstutorial.org/book/>
Free (Ruby on Rails): Learn Ruby on Rails from Scratch
<https://www.udemy.com/learn-ruby-on-rails-from-scratch>
Paid (Course Library): TeamTreehouse: Learn Ruby
<https://teamtreehouse.com/tracks/learn-ruby>