Start working on a new web app which is pure JavaScript, based on the architecture that all the services are behind abstract API layers. Same architecture as Google, Amazon ...
AngularJS for MVC, Jasmine Unit Test, Protractor functional test, Grunt as build framework, JSHint code quality tool, SASS for CSS ...
Under the hood it's Google hand made JavaScript V8 twin turbo chargers engine, coding speed from nil to 60 miles is under 3 seconds, that's impressive.
Angular is dead. vue.js is what you should be using.
Grunt is long gone. Gulp is where it's at.
In fact, don't even bother using Javascript. Clojurescript is what all the cool kids use.
LOL!