Apple recently updated it's website to include Tips and Tricks for iOS 7.
Apple advertises the Tips and Tricks as making "the things you do every day even easier."
There are useful tips about better ways to use swipe gestures, FaceTime, Maps, Siri, Calendar, Music, Mail, photography, Safari, AirPlay and Wireless, Settings, Compass, and Find My iPhone.
Apple's new webpages provide a nice aid for users new to iOS and those practiced users who haven't yet experienced the full potential of iOS.
The Tips and Tricks are short and to the point with attractive visuals.
However, if you're looking for more in-depth instructions on using your iPhone, the iPhone User Guide still provides the most information.