Reset Mac book air to factory settings ?

ani61us Said:

"Reset Mac book air to factory settings ?: I just bought the new M1 and traded in my MacBook Air, How do I reset to factory settings and delete all?"

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Reinstalling the macOS Anew:

I. First: Back up your Mac with Time Machine - Apple Support

Then...

II. Reinstall the macOS Anew:

1. Boot: into Recovery Mode.
2. Open: Disk Utilities
3. Delete: the partition
4. Reinstall: the macOS

Once Installed Anew...

III. Reinstall All the Software:

1. Use Migration Assistant to move Apps a Files back in from the time machine you created in step one from above.
2. Ask developers for new software keys - but contact the developers only --- none other --- or you may end up with malware and spyware installed.

If one is talking about the Trade-in computer - then this is what Apple Suggests