A new feature in iOS 12 is the ability to quiet or turn off notifications for apps right on the lock screen or notifications screen. With a swipe and a tap, you can tell an app to stop showing notifications if you don't want them. You can also view notifications grouped by app or source, so that a single app doesn't monopolize your lock screen or notifications screen.
Related Subjects: iPad (177 videos), iPhone (307 videos)
Very useful, thanks JB