If you’re selling, trading in or giving away your Mac, press Command-Q to exit the setup assistant without completing the setup process, then click Shut Down.

When the installation is complete, your Mac may restart to a setup assistant. Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.If the installer can't see your disk, or it says that it can't install on your computer or volume, you may need to erase your disk first.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.

Reinstalling macOS won’t remove your personal data. When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery.

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