Linux
Linux is the colloquial term used for a series of "Unix-Like" operating systems under similar conditions. 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.) Linux-Like systems are almost always free, as well as the programs made for them; the FOSS (Free-And-Open-Source) mindset is very prevalent within its community.
The subject of Linux is an incredibly complex one that this wiki not only cannot fathom to reach nor will it try to. There are countless resources online to explore Linux further that are a search engine click away.
Many 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. Others are known to work using emulation or Wine (a Windows operating layer).
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
Linux Distros
Installations of Linux are often a group of packages installed together and known distros. A huge collection of different distros can be found at https://distrowatch.com/. DistroWatch also keeps track of the popularity of various distros and their popularity compared to others.
Here are a collection of some of the most well known distros:
Linux Mint
"The Friendly Operating System";[1] A great version when getting started, Linux Mint is made to work well from the get-go and have everything you need to be productive.
Ubuntu
Ubuntu is another very well-known option, however in recent years it has been superseded in popularity by systems like LM and Debian. [2] Popular variants include Kubuntu and Lubuntu, which are primarily changes to the default window manager (aka, what the GUI looks like).
Debian
"The Universal Operating System":[3] tried and true, Debian gets things done. It ain't crazy, but it also won't blow up in your face. The workin' man's distro.
Arch Linux
A simple and lightweight distribution[4] for more advanced users; Arch starts with very little but makes it easy to add whatever your heart desires. Great for enthusiasts as well as others wanting to learn more about Linux and its related components. It is also well known for detailed documentation which often is used for solving problems with other distros as well.[5]
Arch has many variants as well, some of the more popular being Manjaro and EndeavourOS.
Fedora/RHEL
Fedora and RHEL (Red Hat Enterprise Linux) are Linux distros maintained by RedHat[6][7]. Fedora is the FOSS version, while RHEL is the paid enterprise edition for businesses.
Gentoo
One of the most advanced distros on this list, Gentoo takes things another step further by requiring all packages to be installed from source. While this allows for huge leaps in customization, it also means you really need to know what you are doing.[8]