Start with high-confidence ruby programming books, then narrow by subgenre or adjacent topics.
Ruby on Rails Tutorial
Michael Hartl
Eloquent Ruby
Russ Olsen
Rails Cookbook
Rob Orsini
Head First Ruby
Jay McGavren
Ruby Wizardry
Eric Weinstein
The Well-grounded Rubyist, Fourth Edition
Black A. David, Joseph Leo III
Effective Testing With RSpec 3
Myron Marston, Ian Dees
