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Ruby's Important Hook Methods — SitePoint
Concerns in Rails: Everything You Need to Know
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Ruby Mixin | Guide to How Mixin works in Ruby with Examples
Modules in Ruby: The one that cannot be instantiated like Class! | CodeX
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Ruby modules: Include vs Prepend vs Extend | by Léonard Hetsch | Medium
My Journey into Ruby: Modules - DEV Community
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Concerns in Rails: Everything You Need to Know
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A diagram of the Ruby Core object model - Jerome's Adventures in Software
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self, instance methods and class methods in Ruby | by Sophie McGarity | Medium
Ruby programing tutorial - class inheritance & modules
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Include, prepend and extend with Ruby modules - Alberto Almagro
Extending Ruby classes
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