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Personally I find the most effective way to quickly pickup something is by using it in a project. I'd recommend some of these starter projects that you can download and start hacking: http://railsapps.github.io/

Ah, good idea. Thanks so much!

For learning RoR, I can't really recommend enough Agile Web Development with Rails 4 (although you might want to wait for a revised v5 version to pop up).

It takes you through building a simple site with a shopping cart from scratch, and lets you encounter enough real-world style situations to give you a really good grounding.

https://www.railstutorial.org/book

this one obviously.

Michael Hartl's tutorial!

https://www.railstutorial.org/