Recommendations

If you don’t know how something is called (e.g. **) in Ruby, check this project: What do you call this in Ruby?.

Install and Manage Ruby Versions

Recommend ruby-install and chruby. What’s .ruby-version?

Stable versions across all implementations, please check Ruby Versions. Currently you should use Ruby 2.6+ (2021 July 22, Ruby 2.5 is EOL).

HOWTO install Ruby Trunk

But Hey! I am a book person.

Books

Strongly recommend Polished Ruby Programming published in 2021 by Jeremy Evans for anyone who passed the introductory stage.

A free one to get started, hands on: Learn Ruby the Hard Way.

What really got me Ah, I understood a little bit Ruby now, is "Confident Ruby" by Avdi Grimm. If you want to understand deeper about Ruby at lower level: Ruby Under a Microscope.

Writing better code in Ruby: Principles of Object Oriented Design in Ruby and 99 Bottles of OOP by Sandi Metz.

Rubyists

Read their blog post. Watch their Conference presentation (search on YouTube or ConfreaksTV)

Aaron Patterson — Legendary tenderlove, GC, Ruby & Rails Commiter
Avdi Grimm — RubyTapas, he also wrote many Ruby books.
Hongli Lai — Author of Phusion, Passenger, Ruby Memory
Justin Searls — Great Presenter on Engineering Practices
Michel Martens — Simplicity-driven developer
- mote Template Engine in just 42 LOC
- syro A simple router for web applications
- micromachine Minimal Finite State Machine
Mike Perham — Author of Sidekiq - Twitter
Nate Berkopec — Rails performance posts on Speedshop Blog (Newsletter), Puma
[Matthew Draper] — Rails Core Team, ActiveRecord, Threads, ActionCable
Ryan Davis — Many ruby infrastructures are maintained solely by him
Richard Schneems — Sprockets, Rack, Puma, Heroku
Sam Saffron - Benchmarking, performance
Samuel Williams Concurrency, Async I/O, Fibers
Sandi Metz — HOWTO write great Ruby code
Andrew Kane — He wrote many great articles on Ruby on Rails & Ruby.
- ankane/production_rails - Best practices for running Rails in production
- ankane/secure_rails - Rails Security Best Practices
- ankane/search_guide - Best Search practices for developers and code to implement them.
- ankane/the-ultimate-guide-to-ruby-timeouts - Everything you need to know about Timeout in Ruby
- ankane/shorts - Short, random tutorials and posts
Piotr Szotkowski
Jeremy Evans — Ruby Committer, Lead developer for Sequel and Roda
Janko — Author of Shrine (File Upload), Ruby off Rails evangelist
Luca Guidi — Author of Hanami
Ryuta Kamizono — Rails Core Team
Colby Swandale — Author of ruby api, ex-bundler maintainer
Jim Weirich — author of Rake, inspirations for many people

Find more folks: https://github.com/trending/developers/ruby?since=monthly

Blog

Thoughtbot's blog: Giant Robots

They have moved toward Elixir and Elm, but still a lot of gems there.
BigBinary

Concise easy to consume posts about new features of Ruby and Ruby on Rails.
The Pug Automatic by Henrik Nyh

Useful techniques, tricks regarding Ruby and Rails.
MONKEY & CROW by Adam Sanderson

Some deep articles about Ruby Standard Library, Ruby language and Rails.
He writes so many deep dive posts of Ruby

Scenarios

Here is common recommended choice of certain things I learned from talking to people, my experience, etc.

Why you have to pick a good library, gem. Because once your application grew, some libraries have things that they are not good at for your particular edge cases and it's very expensive or a lot of effort to change. These libraries are validated and flexible to handle real-world challenges.

Nowadays I tried to choose boring ones an minimal production (standard library, what big company is using).

Background job: Sidekiq (A case study)
File Uploads: shrine with image_processing
Making Requests: HTTPX gem, HTTP gem
Markdown: CommonMarker with HTML::Pipeline
Emoji: Gemoji and Twemoji (this blog)
Concurrency Tools: Concurrent Ruby
Async I/O: https://github.com/socketry
Time Calculations: Monotonic Time
CLI apps: tty
Learn how to configure all libs’s Timeout
Nokogiri for HTML, XML parsing
Parser and AST gem
Scraping: Kimurai Scraping Framework
Others: See what is trending on GitHub.

Great Posts

Follow @RubyInside / Ruby Weekly to read more like this.

But Hey! I want to read some real Code.

Code Reading

See Code Reading.

Conferences

FAQ

Are companies using Ruby?

See Companies using Ruby.

Single Quote or Double Quote?

Double quote: https://github.com/rails/rails/pull/38841