Reinstall your current version of macOS: Command-R. Reinstall your computer’s original version of macOS (including available updates): Option-Shift-Command-R. Install the latest version of macOS compatible with your computer: Option-Command-R. On an Intel-based Mac: Choose Apple menu > Restart, then immediately press and hold one of these key combinations, depending on what you want to do: On a Mac with Apple silicon: Choose Apple menu > Shut Down, press and hold the power button until “Loading startup options” appears, select Options, click Continue, then follow the onscreen instructions. Start up your computer in macOS Recovery:

Get started with accessibility features.

Use Sign in with Apple for apps and websites.

Watch and listen together with SharePlay.

Share and collaborate on files and folders.

Sync music, books and more between devices.

Make and receive phone calls on your Mac.

Use one keyboard and mouse to control Mac and iPad.Use Live Text to interact with text in a photo.Make it easier to see what’s on the screen.

Install and reinstall apps from the App Store.

Delete parallels from mac