can you install Linux on a computer that originally was sold with Windows 10 OS?

I was thinking of buying a used computer and reformatting the hard drive and installing a version of Linux but then I heard that Windows 10 somehow has embedded code in the BIOS so I wonder if that would make problems then if you try to use another OS?

You can always install a Linux on a WINDOWS10 system after formatting. As far as embedded code in the BIOS is concerned, I think that would be helpful of you want to restore the WINDOWS copy in the system.