Copy on iPhone, Paste on Mac
Have you ever copied something on your iPhone and then emailed it to yourself to paste it somewhere on your Mac?
That's about to change with macOS Sierra. Now when you copy something on your iPhone or iPad, you can go to paste on your Mac and it will paste what you just copied on your iOS device.
This is even simpler than using AirDrop to send something to your Mac since you just need to copy on your iPhone or iPad and then paste on your Mac.