These are only a few of the myriad design patterns available. When possible, do some research and see if there is a pattern for what you're trying to do in your app. Yes, sometimes, your app will require that you do something totally unique, but more often than not you'll find a successful pattern that many apps already use. Your app will be more usable, and your user will thank you for that. You'll also field fewer support calls about how to use your app.