Awesome

Guides

• Ruby style guide
• Rails style guide
• Ruby on Rails guides (no joke)
• Better Specs
• Idiosyncratic Ruby - noncommon Ruby's best practices
• Awesome Ruby
• Awesome Rails
• RSpec Rails examples

Docs

• Apidock
• RubyDocs (offline / online)

News

• RubyFlow
• RubyDaily
• Ruby Weekly
• Green Ruby News
• reddit for rubyists
• reddit for rails hackers

Video & blogs

• Confreaks TV - Video from conferences
• Ruby tapas - Short screencasts about ruby
• RailsClub (ru) - Video from Rails Club on YouTube
• BRUG (ru) - Video from BRUG on YouTube
• Meet ROM_RB & DRY_RB - Piotr Solnica talk about rom-rb and dry-rb

Jobs

• RubyJobs (ru)
• Github Jobs
• Telegram Jobs (ru)

Telegram channels

• Pepegramming (ru)
• Rubyata (ru)
• Pro.ruby (ru)
• Ruby, Rails, Hanami | dry-rb (ru)
• Random Ruby Chat (ru)
• Ruby Talks (ru)

Tools

• Ruby Courses
• Ruby Version Manager (RVM)
• Bundler - manage your app's dependencies
• Ruby Toolbox
• Awesome Ruby - A categorized community-driven collection of awesome Ruby libraries, tools, frameworks and software. The essential Ruby to build modern Apps and Web Apps.
• Awesome Ruby | LibHunt - Another great collection of awesome Ruby gems, a bit more structured, ordered by popularity and github activity.