Meta files missing

I might of deleted a folder in my unity project that was integral to it working. Or, maybe something else? I heard from somewhere else on here that I could delete the library folder or something then restart unity and it will rebuild the files, but how would I go about this? Any help would be appreciated thanks…

Also,
It throw s a repeated error when I open a new project, meta file is missing…

If anyone else has this problem I figured it out, just uninstall unity and delete unity’s directory files, then reinstall unity fresh and it’s like it never happened.