Attempted to factory reset Macbook.
I was given an old laptop to use for myself, and I was attempting to factory reset it. I think I ended up removing the Macintosh HD, and now whenever I try disk startup this comes up. It was on macOS Mojave 14 if I recall, and I'd like to know if it's possible to somehow get it back, or if I'd have to buy a new disk.
I've tried restarting and installing the system it gives (I can't remember what it was called), but nothing has been working, and I can't find any good answers. Thank you for any help!
MacBook Pro