The Ruby Programming Language: Everything You Need to Know

Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby)

Learning Chef: A Guide to Configuration Management and Automation

Ruby: Learn Ruby in 24 Hours or Less - A Beginner’s Guide To Learning Ruby Programming Now (Ruby, Ruby Programming, Ruby Course)

Eloquent Ruby (Addison-Wesley Professional Ruby Series)

Ruby on Rails Tutorial: Learn Web Development with Rails (Addison-Wesley Professional Ruby Series)

Ruby Cookbook: Recipes for Object-Oriented Scripting

Head First Ruby: A Brain-Friendly Guide

Learning Python: Powerful Object-Oriented Programming

Docker: Up & Running: Shipping Reliable Containers in Production