There's more to open source than desktop Linux ...

There’s no shortage of Linux operating systems available. However, many Linux distributions (distros) are niche OSes. For instance, Kali Linux is an ethical hacking and ***** testing Linux distro.

Qubes OS defines itself modestly as “a reasonably secure operating system.” It might actually be one of the safest operating systems, often used by pros who are most concerned with computer security.

I've used nearly every possible desktop operating system known. I've experienced nearly every incarnation of Windows and MacOS, I've used just about all the various Linux distributions over the years, ...