Learning something from scratch is almost always an arduous affair -- you simply have no idea as to where to start, or not to start, to kick things off. You don't have to worry about finding the best resources, sorting out the bad ones, and figuring out what to learn next. It's all here. Just follow it, step by step.
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Learn to Program
Why's (Poignant) Guide to Ruby
Programming Ruby 1.9 & 2.0
The Ruby Programming Language
Learn Ruby The Hard Way
Learn Ruby on Rails (Daniel Kehoe)
Ruby on Rails Tutorial
Agile Web Development with Rails
Practical Object-Oriented Design in Ruby
The Well-Grounded Rubyist
Rails 4 in Action
Crafting Rails 4 Applications
Metaprogramming Ruby
Rails AntiPatterns: Best Practice Ruby on Rails Refactoring
The Rails 4 Way
Eloquent Ruby
Design Patterns in Ruby
Capstone Rails Tutorials
How to develop a social network using Ruby on Rails
SaaS Course - The welcome word - Prograils
Facebook Authentication in Ruby on Rails
Google Authentication in Ruby On Rails
Gmail Like Chat Application in Ruby on Rails
Private Inbox System in Rails with Mailboxer
Building a Ruby Gem in 2015 - Matt Brictson
24 Extremely Useful Ruby Gems for Web Development
Setting up Sublime Text 3 for Rails Development - Matt Brictson
Sitios famosos hechos con Ruby
Twitter
Slideshare
Github
Shopify
AirBnb
Groupon
SoundCloud
Square
Heroku
Basecamp
Yellow pages
Hulu
Urban Dictionary
CrunchBase
Bloomberg
Zendesk
Scribd
Bleacher Report
500px
Ask.fm
Dribbble
Funny or Die
Goodreads
Indiegogo
Kickstarter
LivingSocial
Lumosity
MyFitnessPal
Pixlr
Strava
Twitch
We Heart It
Whitepages
Yammer
ThemeForest
RailsApps Example Applications - Code from the Capstone Rails Tutorials
Treebook - A social networking web application with features similar to Facebook.
Socify - Socify is an open source social networking platform written in Ruby on Rails.
Sample App - The sample app for the 3rd edition of the Ruby on Rails Tutorial.
Pinteresting - This is the pinteresting sample application for One Month Rails
MyRecipes -A recipe app written in Ruby on Rails.
@dhh : The creator of Ruby on Rails. Posts insight on new releases and various tips.
@rbates : Producer of Railscasts, posts tips and tricks very often.
@rails : The official Ruby on Rails Twitter account. Follow them if you want insight on release dates, and development.
@rails_apps : Daniel Kehoe is posting new Rails example apps pretty often, pretty useful.
RailsCasts: Ruby on Rails Screencasts
GoRails
The Best of RailsConf 2015
Railsconf 2014, Talks I Liked
Favorite talks of RailsConf 2013
twilio-ruby - A module for using the Twilio REST API and generating valid TwiML.
twitter - A Ruby interface to the Twitter API.
wikipedia - Ruby client for the Wikipedia API.
databasedotcom - Ruby client for the Salesforce's Database.com and Chatter APIs.
Dropbox - Dropbox API Ruby Client.
facy - Command line power tool for facebook.
fb_graph - A full-stack Facebook Graph API wrapper.
flickr - A Ruby interface to the Flickr API.
gitlab - Ruby wrapper and CLI for the GitLab API.
gmail - A Rubyesque interface to Gmail, with all the tools you'll need.
hipchat-rb - HipChat HTTP API Wrapper in Ruby with Capistrano hooks.
instagram-ruby-gem - The official gem for the Instagram REST and Search APIs.
itunes_store_transporter - Ruby wrapper around Apple's iTMSTransporter program.
linkedin - Provides an easy-to-use wrapper for LinkedIn's REST APIs.
Octokit - Ruby toolkit for the GitHub API.
Pusher - Ruby server library for the Pusher API.
ruby-gmail - A Rubyesque interface to Gmail.
ruby-trello - Implementation of the Trello API for Ruby.
Slack ruby gem - A Ruby wrapper for the Slack API.
soundcloud-ruby - Official SoundCloud API Wrapper for Ruby.
Yt - An object-oriented Ruby client for YouTube API V3.
t - A command-line power tool for Twitter.
tweetstream - A simple library for consuming Twitter's Streaming API.