BLINKING FOLDER
Accidentally erased hd macintosh os thing on the disk utility set up and now the macbook turns on and shows a blinking folder with a question mark
MacBook
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Should you have backup of MacBook system on Time Machine external
USB drive, that may suffice to restore the Mac to last backup state.
• If your Mac starts up to a question mark - Apple Support
https://support.apple.com/en-us/HT204323
(You may also try to use macOS recovery and see if the Mac's partition
where this could be restored from, has not been erased as well.)
• How to reinstall macOS - Apple Support
https://support.apple.com/en-us/HT204904
There are several articles to describe and detail how to perform this.
• Restore your Mac from a Backup - Apple Support
https://support.apple.com/en-us/HT203981
• If you can't back up or restore you Mac using Time Machine - Apple Support
https://support.apple.com/en-us/HT204157
(If no other solutions work, start over: Erase your backup disk, then
use Time Machine to select it as your backup disk again.)
Depending on your backup, which system and format used, details may vary.
Good luck & happy trails!
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