Here are some references to get you started with backend development with Ruby on Rails (http://rubyonrails.org/).
Ruby Basics
Online courses:
Familiar with Ruby's community (one strong reason people use RoR)
Advanced: Other Ruby tools / libraries
Ruby on Rails
Get a taste of how Ruby on Rails is like by following the step by step tutorials:
http://railsgirls.com/materials.html
Here is the comprehensive ebook that covers all the Rails basics:
https://pragprog.com/book/rails51/agile-web-development-with-rails-5-1
Online courses:
https://launchschool.com
https://gorails.com/
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