Well, think on a feature of Angular 2 that you think it's interesting, like pipes, for example i needed a filter pipe, but it doesn't exist in Angular 2 so i just took a look to the one in Angular 1 and translated to ES6, now i have an Angular 2 filter pipe, so the other way around could work, pick a cool feature and try to understand how it works, what dependencies add to the feature and how all fits on its place, you could start with the router as that's one of the main parts of the Angular 2 framework.