How to Re-install macOS from macOS Recovery [VIDEO]

Apple has published a handy tutorial video on its YouTube channel, detailing how you can use macOS Recovery, your computer’s built-in recovery system, to reinstall the Mac operating system.

Simply follow the steps below to re-install macOS using macOS recovery:

1. Back up your Mac, if possible. Reinstalling macOS doesn’t remove your apps or personal data, but it’s still a good idea to make a backup first.
2. Start up from macOS Recovery. The steps to do this depend on the type of Mac you’re using.
3. After starting up from macOS Recovery, you should see a list of options, including the option to install or reinstall macOS. Select that option, then click Continue and follow the onscreen instructions.
4. Allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
   • If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.
   • If the installer offers the choice between installing on “Macintosh HD” or “Macintosh HD – Data”, choose Macintosh HD.
5. After installation, your Mac might start up to a setup assistant. Follow the steps in the setup assistant. However, if you’re selling, trading in, or giving away your Mac, quit the setup assistant without completing setup, then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

To learn more, watch the following video.