angular.io - Official documentation
next.angular.io - Detail of Upcoming version of Angular.
Dive deep into a concept and understand why it is implemented the way it is. Jump right into the code! Angular is open source, and you can check out every implementation in Angular GitHub repo here:
Want to learn more about Angular Routing and navigation?
Step-by-Step Angular Routing by Nishu Goel
Follow the codelab where I list down step by step, the building and packaging of custom elements, and usage in other projects.