Once you have erased your disks, quit Disk Utility and return to the utilities window. After the erasure concludes, select any other internal volumes in the sidebar, then click the delete volume button in the toolbar to delete that volume. If you don't see this button, click Erase instead. If you have an older MacBook Air select Mac OS Extended (Journaled). Select the disk format as APFS if you're running macOS 10.13 High Sierra or later. Select Macintosh HD in the sidebar of Disk Utility and click the Erase button in the toolbar. From the utilities window, select Disk Utility and click Continue. If asked, select a user you know the password for, then enter their administrator password. This can be done by turning on your Mac, then immediately pressing and holding the Command and R keys. 
Power up your MacBook Air into recovery mode.The steps below are for those on macOS Big Sur and earlier versions. If you're running macOS Monterey or later, head to this guide to erase all your data. We can finally move on to the factory reset process of your MacBook Air where all your data, apps, and settings will be removed. Click on the iMessage tab and you should see the option to Sign Out next to your Apple ID.
Open the Messages app on your MacBook Air, click Messages from the top menu bar, and choose Preferences.Finally, you should sign out of the Messages app.You will be asked to enter your Apple ID and password to confirm the same.
Open the drop-down menu, and click on Authorizations, then Deauthorize This Computer. On the top menu bar, you should see the option for Account. Next, sign out of your Apple Music account, or iTunes account if your MacBook Air is running on macOS Mojave (version 10.14 or below). Earlier versions of macOS should directly have the Sign Out button. On the left side, select Overview, and click on the Sign Out button at the bottom. If you're using an older version of macOS, click iCloud instead. Click on Apple ID if you are using macOS Catalina (10.15) or later. Open the Apple menu in the upper-left corner and click on System Preferences.
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