Also I will add Practical Object Oriented Design in Ruby, by Sandi Metz (https://www.poodr.com/). It was a great help to me when I was first beginning to self teach programming years ago. A lot of it applies no matter the language; I haven't written Ruby in probably 4 years but the principles in that book guide my programming to this day.

Agreed, this is a great book. In the past I used to read and write a lot of Ruby. An earlier edition of the book was the single resource that taught me the most.

The only programming language book I've enjoyed and benefited from as much since then is Fluent Python.

Highly recommended! I started with the Rails Tutorial as well and read The Well-Grounded Rubyist afterwards to get more in-depth with Ruby.

After that, I bought Bob Race‘s tutorial Build a Saas App with Rails which covers more practical aspects of building a multi-user SaaS app using well-known gems (instead of building everything by myself as in the Rails tutorial): https://leanpub.com/basair6

Great book. I own the second edition.

That was one of the books I picked up early in my career and still keep a well-loved, dog-eared copy. It's information-dense without being overwhelming, and teaches a lot of important Ruby concepts. I'm glad to see it's being kept up to date.