I restarted my Mac book to sell and now it is has a folder with a question mark
i am selling my MacBook did the reset with command r and now it is flashing a folder and a question mark in it
MacBook Pro 13″, macOS 10.15
After erasing the whole physical drive you need to reinstall macOS. Here is an Apple article on how to prepare your Mac for sale or recycling including instructions for installing macOS:
What to do before you sell, give away, or trade in your Mac - Apple Support
