Where should I use AngularJS and jQuery?

Answer 1

AngularJs is a framework that is more like an architectural standpoint of your web project, written in javascript. JQuery is more specific, it handles the specific components that you will use in your web project, say: datepicker, dialog box etc.

Of course your are not required to use any of those and just write everything in plain javascript. But when you projects grows in file size wise and code wise, those type of frameworks and libraries tends to structure your code by their limits.