I came across this StackOverflow answer today and thought is was fantastic advice to those new to Angular.
One thing that stuck out was about how to view and work with directives.
Some directives just decorate what’s already in the view (think ngClass) and therefore sometimes do DOM manipulation straight away and then are basically done. But if a directive is like a “widget” and has a template, it should also respect separation of concerns. That is, the template too should remain largely independent from its implementation in the link and controller functions.
AngularJS comes with an entire set of tools to make this very easy; with ngClass we can dynamically update the class; ngBind allows two-way data binding; ngShow and ngHide programmatically show or hide an element; and many more - including the ones we write ourselves. In other words, we can do all kinds of awesomeness without DOM manipulation. The less DOM manipulation, the easier directives are to test, the easier they are to style, the easier they are to change in the future, and the more re-usable and distributable they are.
I see lots of developers new to AngularJS using directives as the place to throw a bunch of jQuery. In other words, they think “since I can’t do DOM manipulation in the controller, I’ll take that code put it in a directive”. While that certainly is much better, it’s often still wrong.
I find that if I’m doing much work with jQuery, I often can refactor my code to be more like the “Angular Way” and not deal with jQuery. Angular makes it dead simple to do so once you understand a few concepts.