If you know other programming languages, especially object oriented ones, I'd recommend spending a couple days on Ruby. Line between Rails and Ruby is kinda blurry

* Have a look at the syntax: https://learnxinyminutes.com/docs/ruby/

* Work through the Ruby koans: https://github.com/edgecase/ruby_koans

* If you have time or desire, look through the Poignant's Guide to Ruby: https://poignant.guide

It is a wonderful language. Good luck.