[Shameless plug]: I've been writing a book on Angular 2 over the past few months: ng-book 2 [1]. If you want to write your first app, you can get the first chapter of our book for free.
You can of course learn Angular 2 from lots of disparate blogs on the internet. There's lots of good resources. But the goal of our book is that you'll be able to learn everything, in-order, in one place.
We've been keeping the book updated alongside Angular's development (though it will take us a few days to get up to the most recent beta). We've already updated the book over a dozen times, so I think you'll really like it.