Use FaceTime on Mac - Apple Support

FaceTime makes it easy to have a video or audio call. All you need is a broadband internet connection and a built-in or connected microphone and camera.

Use video effects during FaceTime calls on Mac - Apple Support

Apple Music User Guide for Mac - Apple Support (CA)

Customize your Mac with System Settings - Apple Support

FaceTime - Wikipedia

Use Handoff to continue tasks on your other devices - Apple Support

Work in multiple spaces on Mac - Apple Support

14 Best solutions to fix FaceTime not working on Mac

FaceTime User Guide for Mac - Apple Support

Mac owners unable to log in to Messages, FaceTime after OS X 10.11