Magic Keyboard for 14-inch and 16-inch MacBook Pro
The Magic Keyboard with Touch ID has built-in features that make it easy to enter emoji, switch keyboard languages, lock your MacBook Pro, and perform many system functions with the touch of a key. You can set up Touch ID and then use your fingerprint to unlock MacBook Pro, quickly lock your screen, or make purchases from the App Store, Apple TV app, Apple Books, and on websites using Apple Pay.
Set up Touch ID. You can set up Touch ID during setup, or at a later time in the Touch ID pane of System Preferences. For more information about Touch ID, see Set up your MacBook Pro.
Turn on your MacBook Pro. Lift the lid or press any key. If you’ve set it up, you can press the Touch ID to turn on your MacBook Pro.
Use Touch ID. After you set up Touch ID, when you start up or restart the computer, you need to log in by typing your password. After initial login, whenever you’re asked for your password in the same session, you can just place your finger lightly on the Touch ID sensor to authenticate. You can also use Touch ID to make online purchases securely with Apple Pay. For more information about Apple Pay, see Use Apple Pay on your Mac.
Lock your MacBook Pro. Press the Touch ID key to quickly lock your screen.
Turn off your MacBook Pro. To turn off your MacBook Pro, choose Apple menu 
> Shut Down. To put your MacBook Pro to sleep, choose Apple menu > Sleep.
Use function keys. The function keys on the top row provide shortcuts for these common system functions:
Brightness (F1, F2): Press
or 
to decrease or increase the brightness of the screen.Mission Control (F3): Press
to view what’s running on your MacBook Pro, including all your spaces and open windows.Spotlight Search (F4): Press
to open Spotlight and search for something on your MacBook Pro.Dictation/Siri (F5): Press
to activate dictation—you can dictate text wherever you can type (for example, in Messages, Mail, Pages, and other apps). To activate Siri, press and hold , then immediately speak your request.Do Not Disturb (F6): Press
to turn Do Not Disturb on or off. When Do Not Disturb is on, you won’t see or hear notifications on MacBook Pro, but you can view them later in Notification Center.Media (F7, F8, F9): Press
to rewind, 
to play or pause, or 
to fast-forward a song, movie, or slideshow.Mute (F10): Press
to mute the sound from the built-in speakers or 3.5 mm headphone jack.Volume (F11, F12): Press
or 
to decrease or increase the volume of sound from the built-in speakers, 3.5 mm headphone jack, or Bluetooth audio device.
Note: Function keys can perform actions in specific apps or may have alternative functions—for example, the F11 key can hide all open windows and show the desktop. To trigger the alternative function associated with a key, press and hold the Function (Fn)/Globe key 
while you press a function key.
Use emoji or switch keyboard languages. Press the Function (Fn)/Globe key to switch to a different keyboard. Press repeatedly to cycle through emoji options or other languages you specify in Keyboard preferences, or press twice quickly to start dictation (if you set that preference).
Set keyboard preferences. To specify options for your keyboard and the Function (Fn)/Globe key , open System Preferences, click Keyboard, and choose options to change your keyboard or input source, show emoji and symbols, start dictation, or define functions.
Learn about keyboard shortcuts. You can press key combinations to do things on your MacBook Pro that you’d normally do with a trackpad, mouse, or other device. For example, press Command-C to copy selected text, then click where you want to paste the text and press Command-V. For a list of commonly used shortcuts, see Keyboard shortcuts on your Mac. If you’re new to the Mac, you might also be interested in Are you new to Mac?.