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

The Ruby Programming Language: Everything You Need to Know

Ruby on Rails Tutorial (Addison-Wesley Professional Ruby Series)

Polished Ruby Programming: Build better software with more intuitive, maintainable, scalable, and high-performance Ruby code

Eloquent Ruby (Addison-Wesley Professional Ruby Series)

Practical Object-Oriented Design: An Agile Primer Using Ruby

High Performance PostgreSQL for Rails: Reliable, Scalable, Maintainable Database Applications

Programming Ruby 3.3: The Pragmatic Programmers' Guide (Pragmatic Programmers; Facets of Ruby)

Rust in Action

Layered Design for Ruby on Rails Applications: Discover practical design patterns for maintainable web applications