Books
- 99 Bottles of OOP (goodreads)
- Design Patterns in Ruby (goodreads)
- Programming Ruby: The Pragmatic Programmers' Guide (goodreads)
- Practical Object Oriented Design in Ruby (goodreads)
- Refactoring: Ruby Edition Book (goodreads)
- Test-Driven Development: By Example (goodreads)
Online books/courses/tutorials
- Design Principles and Design Patterns (PDF) [C]
- Launch School - Object Oriented Programming with Ruby (website)
- Refactoring guru - Design patterns (website)
- thoughtbot books (website):
Articles/blogposts
- Keep It DRY, Shy, and Tell the Other Guy (PDF)
- Shopify's Upgrow - A sustainable architecture for Ruby on Rails (website)
- The Four Elements of Simple Design (website)
Video
- Core Design Principles for Software Developers (video)
- RailsConf 2020 (website)