haven't already read part 1, 2 & 3, I would highly recommend it.
Let's just get
Work smarter, not harder!
I believe that many roads lead to Rome. In this specific case I found an IMHO awesome introduction to the fundamentals of AngularJS. I don't think I could do a better job - so please enjoy Dan Wahlin's excellent introduction "AngularJS Fundamentals In 60ish Minutes" (it's actually 70 minutes :).
With love from Switzerland,