I'm sharing this link here because I did not know much about BSD, except a few odd facts.

For example, the PlayStation 4's OS is based upon FreeBSD.

Something I learned from the article:

Operating systems needs kernels. Linux is a kernel, which is why there are many operating systems for it. (Red Hat, Debian, Arch, etc)

I don't know why I was confused about that considering I recently was at school for it, I somehow thought of operating systems and kernels as being interchangeable for some reason.

Also, macOS is apparently based off of BSD as well, which I did not know either.