To turn VoiceOver on/off: Simultaneously, press the Command key (key to the left of the Space key) Function key (left key in bottom row) and F5 key (key in top row, 7th key from the left). This interactive VoiceOver tutorial guides users through individual VoiceOver commands paired with practice exercises. The first time that you start VoiceOver on the Mac, you can choose to take the Quick Start tutorial, an interactive tour of VoiceOver navigation and interaction basics.

VoiceOver is a screen reader that is integrated into the Mac operating system enabling users with visual impairments and blindness to control and interact with the Mac.