Reference of ionic directives and services


I cannot find any reference to ionic specific directives and built-in services (delegates??) anywhere on the site, can someone please share the link?

I am new to ionic and trying to find answers to a number of questions. Any help will appreciated.

I don’t know the difference between using and using classes in DIV elements to create a header bar. I need to look at the references for the definitions so that I can help myself.

Thank you for your help!