- http://exploringjs.com/
- http://eloquentjavascript.net/
- http://learnxinyminutes.com/docs/javascript/
- https://grasshopper.codes
- http://poignant.guide/book/
- http://www.codecademy.com/en/tracks/ruby
- https://www.codeschool.com/paths/ruby
- https://www.ruby-lang.org/en/documentation/quickstart/
- http://learnxinyminutes.com/docs/ruby/
- http://iwanttolearnruby.com/
- https://rubymonk.com/
- https://www.bloc.io/ruby-warrior#/
- HARD http://www.codewars.com/?language=ruby
- http://www.codequizzes.com/
- http://bento.io/