ruby tutorial - Robuta Search

https://github.com/learnenough/rails_tutorial_7th_edition_gemfiles

Gemfiles for the Ruby on Rails Tutorial (7th edition) - learnenough/rails_tutorial_7th_edition_gemfiles

https://www.hackerrank.com/challenges/ruby-tutorial-everything-is-an-object/submissions

https://www.educba.com/software-development/software-development-tutorials/ruby-tutorial/

This tutorial will help you learn Ruby in a simple and effective manner so you won't face any difficulty in learning Ruby.

https://learnrubyonline.org/

learnrubyonline.org is a free interactive Ruby tutorial for people who want to learn Ruby, fast.

https://www.hackerrank.com/challenges/ruby-tutorial-object-methods/leaderboard?page=3402

Find if a number is even or odd.