Erase macbook air
Can’t find erase content and settings in system preferences under general tab. Need to erase entire system but can’t figure out how.
See the following Apple Support article for information on erasing a MacBook Air: What to do before you sell, give away, or trade in your Mac - Apple Support
Note that step 2 "Erase Content and Settings" only applies to newer Macs. Use the other steps instead on older Macs.