New Mac, erasing old one
When I open the disk utility and select the Mac HD, the "erase" button is not selectable. But the "Apple SSD AP1024M Media" Is able to be deleted what do it do?
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The storage drive needs to be accessed in macOS Recovery with Disk Utility, to erase
the system, and then use macOS Utilities to reinstall a new system. Which could be
left 'as-new' for different owner set up & personalize it; after Mac is ready for one.
• What to do before you sell, give away, or trade in your Mac - Apple Support
https://support.apple.com/en-us/HT201065
• About macOS Recovery on Intel-based Mac computers - Apple Support
https://support.apple.com/en-us/HT201314
• Erase a volume using Disk Utility on Mac - Apple Support
https://support.apple.com/guide/disk-utility/erase-a-volume-dskutl14079/16.0/mac/10.13
• How to reinstall macOS - Apple Support
https://support.apple.com/en-us/HT204904
• How to erase an Intel-based Mac - Apple Support
https://support.apple.com/en-us/HT208496
The idea would be to use the utility a certain way, to unmount the drive
& erase it. Otherwise a utility itself cannot work within the same system.