Reference Materials for Web Development and Programming

Superhero.js — A collection of the best articles, videos, and presentations on “Creating, testing and maintaining a large JavaScript codebase”.
JavaScript: The Good Parts
JavaScript. The Right Way
A re-introduction to JavaScript (JS Tutorial)
JS Must Watch

GitHub

Perf.rocks — Find resources that help you build lightning-fast websites.
Browserhacks — An extensive list of browser-specific CSS and JavaScript hacks from all over the interwebs.
Web Design Field Manual
HTTP API Design Guide
Butterick’s Practical Typography
Web Fundamentals — Best practices for modern web development.
Single page apps in depth
Grid — A simple guide to responsive design.
How to lose weight in a browser
North — North is a set of standards and best practices for developing modern web-based properties. Included are standards and best practices for all aspects of a project, from kick-off through development. North encourages an agile, content-first, approach to product development and a mobile-first, in-browser, system-based approach to design and development.
Software Licenses in Plain English
Frontend Development
Web Concepts: Overview

Project Euler — Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.
checkio — Coding games for beginners and advanced programmers where you can improve your coding skills by solving engaging challenges and fun task using Python and TypeScript.
codingame — STEP UP YOUR CODING GAME. The new way to improve your programming skills while having fun and getting noticed.
coderbyte — Challenge yourself to code and interview better.