This process is ridiculous. I'm 3 hours in and I can't wipe this Mac.
how do you wipe a MacBook Air to get it ready to sell?
MacBook Air 13″, macOS 12.4
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It depends on which model you have.
If it is fairly recent, it is extremely easy: System Preferences->Erase Content and Settings.
Otherwise, follow the instructions here:
What to do before you sell, give away, or trade in your MacOfficial Apple Support › en-us