ECMAScript

http://www.ecma-international.org/

A re-introduction to JavaScript (JS tutorial)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript/

JavaScript Guide

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/

Learn X in Y minutes

Where X = JavaScript

https://learnxinyminutes.com/docs/javascript/

Private Members in JavaScript

http://www.crockford.com/javascript/private.html

Prototypal & Inheritance in JavaScript 

http://javascript.crockford.com/inheritance.html

http://javascript.crockford.com/prototypal.html