erase all content
erase all content on MacBook Air BigSur
erase all content on MacBook Air BigSur
Depending on why you want to erase, and which MacBook Air…
… What to do before you sell, give away, or trade in your Mac - Apple Support
… Use Disk Utility to erase an Intel-based Mac - Apple Support
… Use Disk Utility to erase a Mac with Apple silicon - Apple Support
Depending on why you want to erase, and which MacBook Air…
… What to do before you sell, give away, or trade in your Mac - Apple Support
… Use Disk Utility to erase an Intel-based Mac - Apple Support
… Use Disk Utility to erase a Mac with Apple silicon - Apple Support
On an M1 MacBook Air you can also use a second Mac with Apple Configurator 2 and do a restore which will entirely wipe the internal drive and restore Big Sur or Monterey to it as if it were a new machine.
If MacBook is 2018+ year upgrade to Monterey and simply Erase all content and settings it is very simple.
This is the best way for 2018+ MacBooks
erase all content