Things that can be useful to always have open, to print and leave under your pillow at night:

• ./just-enough-javascript.md: all the JavaScript you will need for Welcome to JS, no more no less. This document also includes translations between JavaScript and PseudoCode.
• ./variable-declare-initialize.jpg: a diagram with labels for all the parts of a variable declaration+initialization, (from blog.jordanholt.com)
• ./variable-box.png: a simple way to think of variables, from javascript.info.
• ./data-types.jpg: a diagram showing the main data types in JS (from simplesnippets)
• ./operators.jpg: a quick reference of the most common JS operators
• ./js-cheat-sheet.pdf: a thorough guide to JS syntax and features with vocabulary and diagrams. (PS. if you know the original author send us a PR so we can credit them)