These two books were the foundation of my Ruby Education:
The Well Grounded Rubyist by David A Black
Practical Object Oriented Design by Sandi Metz
WGR gave me the basics of the language and a working knowledge the Ruby Standard Library.
POODR taught me what Object Oriented Programming was and how two write Ruby.
Eloquent Ruby by Russ Olsen is a excellent read as well and will help you write idiomatic Ruby.
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