A set of links that I considered interesting to share…

CSS3

• Learning Principles for Improving Your CSS
• The Code Side Of Color 
• The Cross-Browser CSS3 Rule Generator
• CSS3 Solutions for Internet Explorer
• SMACSS: Scalable and Modular Architecture for CSS

Design

• An Introduction to Color Theory for Web Designers
• The design inspiration.com
• Best web gallery.com
• Dribbble.com
• Webdesign.tutsplus.com
• Codepen.io
• Invisionapp.com

Develop

• Smashing Magazine.com
• Smashing Magazine: Talks to help you become a better front end engineer in 2013
• Deanhume.com (Coding Tips & Tricks)

General Links

• Web platform.org
• Can I use: Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers
• Learn to code interactively, for free: Codecademy
• Codeacademy: Learn to code interactively, for free.
• Computer Science Education Resource Guide

HTML5

• All You Need to Know About the HTML5 Data Attribute
• HTML5 Async Scripts

JavaScript

• Writing Fast, Memory-Efficient JavaScript
• Slide Elements in Different Directions
• JSbooks: The best free JavaScript resources

Regular Expression

• Regular Expression Tester

Books

• Clean Code: A Handbook of Agile Software Craftsmanship
• Writing Secure Code, Second Edition
• Don’t Make Me Think: A Common Sense Approach to Web Usability, 2nd Edition
• Secrets of the JavaScript Ninja