This useful guide from iMore tells you what notifications are, and how to make sure you're only seeing the important ones.
Notification Center does all it can to make sure you get all the alerts you need. But how exactly does it work? If you see a notification on the Lock screen, what can you do with it? If you're on the Home screen or in an app, how do you even get to Notification Center? If you get a banner or a popup, what can you do with it? Well, if you have Notification Center questions, we have answers!