Must Read
How to use Chrome developer tools to test layouts
There are some very impressive tips and techniques in this article. You will definitely learn something new.
Learn
Design and Build Your Own JavaScript Library: Tips & Tricks
A good read if you ever thought of packaging some of your code into a library. Lots of good tips, techniques and best practices.
Build A Simple Mobile App With NativeScript And Angular 2
Build a simple todo-like NativeScript Android and iOS application using Telerik NativeScript and Angular 2.
Getting Started with TDD in React
Learn how to test React components using a TDD approach with minimal setup, while learning exactly what to test and how to avoid common pitfalls.
CSS coding techniques
In this article you will see some tips and recommendation to write better, easier-to-maintain CSS code, so your stylesheets are shorter and have fewer rules..
Complex Component Design in Ember.js
The first part of a 4-part series on component design in Ember.js
Tools & Code

microlight.js 2.2k
Unlike other code-highlighting solutions, microlight.js does not keep a set of rules for many languages. Instead it uses a general highlighting strategy providing a reasonable highlight for most of them.

Monaco Editor
The Monaco Editor is the code editor that powers VS Code. It is open source and choke full of features.
Interesting Links
Win 5 Books, Sublime Text or WebStorm Liceneses
We are giving away some useful stuff for developers, check it out and good luck.