MacBook not starting / booting after change done in user permissions with sudo
Problem: Unable to reboot the Mac due to issue listed above.
Solution: Backup and Reinstall MacOS
Problem: Unable to solve the problem because reinstalling MacOS doesn't happen correctly and completely
Solution: Erase your disk (Ensure backup before you erase the disk)
Problem: Need to Backup Data before erasing disk
Solution: https://tanishqdhangar.medium.com/reinstalling-macos-but-need-to-backup-to-google-drive-before-clearing-your-disk-824530101203
Problem: Unable to erase disk; Couldn't unmount disk
Solution: Create a new partition (not volume) and reinstall MacOS on the newly created partition. (Please do not do it if you are not sure what you are doing!!)
Disclaimer: Author does not claim the method and is not responsible for any ill happenings. Do it at your own risk. ;)