Here is a very nice step-by-step intro tutorial for AngularJS, from the AngularJS official site. You will see how the angularjs code is added to the sample project and for what purpose. I highly recommend this tutorial for anyone wanting to try out AngularJS.
At the end of the tutorial, there are more useful links for development. For example, the angular-seed project, and the AngularJS cookbook. Also, try out this ng-boilerplate project to kickstart your AngularJS projects.
P.S. This http://www.egghead.io/ is also an awesome tutorial site!