Tutorials

HTML Tutorials

W3 Schools - HTML
MDN - HTML

CSS Tutorials

W3 Schools - CSS
MDN - CSS

JavaScript Tutorials

W3 Schools - JavaScript
MDN - JavaScript

jQuery Tutorials

W3 Schools - jQuery
TutorialRepublic - jQuery

Design & Development

W3C: Design & Development

Web Fonts

Font Display Property
Using System Fonts
Adobe Magazine: Variable Fonts

Flex Boxes

Flex Box Guide
Flex Box Cheat Sheet (Interactive)

CSS Media Queries

Tutorial Republic: Understanding Media Queries
CSS Tricks: A Complete Guide to Media Queries
W3 Schools - CSS Media Rules
MDN - Using Media Queries

Creating Zip Archives

Mac OS
Windows

Planning

Visual Site Mapping
Beginner’s Guide to Wireframing

Design

50 design terms explained simply for non-designers
Understanding RGB Color
Startups, this is how design works

Social Media

FaceBook Social Plugin Buttons

Search Engine Optimization

Meta Tags for SEO
Google SEO Starter Guide