There is some basic information that is good to know before venturing deeper into AngularFire2; it's about core objects and what their responsibilities are:

• AngularFireAuth
• FirebaseObjectObservable
• FirebaseListObservable

AngularFireAuth deals with authentication. FirebaseObjectObservable is the core object you want to talk to when you know that the database property you deal with is of the type object. Lastly, FirebaseListObservable is the object that acts like a list. From before, we know that Firebase lists aren't really lists, but that doesn't stop this object from having methods on it that a list would normally have.