Everything you need to become an expert in web development

Ruby language

CodeSchool interactive course Getting Started with Ruby

Programming Ruby The Pragmatic Programmers' Guide to Ruby

why’s (poignant) guide to Ruby Crazy Ruby tutorial

Ruby Programming Ruby Programming Wikibook

API docs Ruby, Rails and RSpec documentation with users notes

Ruby style guide Community-driven Ruby coding style

Ruby basics Whirlwind tour to Ruby

Ruby on Rails

http://guides.rubyonrails.org/ Ruby on Rails guides

Agile Web Development with Rails 4 Book about building agile web applications with rails

RailsCasts Screencasts by Ryan Bates

Ruby on Rails tutorial Tutorial by Michael Hartl

Rails style guide Community-driven Rails best practices and style

HTML & CSS

HTML(5) Tutorial W3Schools HTML tutorial

CSS(3) Tutorial W3Schools CSS tutorial

CSS Reference Extensive CSS reference

Bootstrap CSS Bootstrap CSS documentation

JavaScript

JavaScript path Interactive CodeSchool courses

Eloquent JavaScript Book about JavaScript best practices

JavaScript: The Definitive Guide The bible for JavaScript programmers

jQuery API jQuery API documentation

Database Tools

SQL Tutorial W3Schools SQL tutorial

PostgreSQL Documentation PostgreSQL manual

Version Control Management

Try Git Getting started with git

Git book Pro Git book