Linux
Linux is the colloquial term used for a series of "Unix-Like" operating systems under similar ideologies. Linux itself is the kernel most commonly used with them, however there are others that may be used in its place (like BSD, for example.)
Many of the professional video editors are not available on Linux. However, most editors like Kdenlive and Blender are openly available, making them common choices for Linux tennis players.
History
Unix
Unix is a collection of operating systems, most of which are closed source. They serve as the basis for Linux, Mac OS (specifically Berkeley Unix), IRIX, and many others.
The original version, AT&T-Unix, was made in 1969 for PDP-11 systems.
While its derivatives have common use cases for tennis-related stuff, Unix itself is almost never seen in the tennis scene.
https://en.wikipedia.org/wiki/Unix
Common Versions of Linux
Most Linux versions are often called distros. Find some yourself at https://distrowatch.com/
Here are a collection of some of the most popular distros:
Ubuntu
Ubuntu was the most popular Linux distro for a very long time, often the distro that most people think of when someone mentions Linux.
Debian
The tried and true, Debian gets things done. It ain't crazy, but it won't blow up in your face. It's the workin' man's distro.
Arch Linux
yea son
Fedora/RHEL
Fedora and RHEL (Red Hat Enterprise Linux) are Linux distros maintained by RedHat. Fedora is the FOSS version, while RHEL is the enterprise edition for businesses. RHEL is one of the few actively maintained Linux distros that has consistently not been free.
Gentoo
no