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Linux vs Windows tested in 10 games - Linux 17% faster on Average
(video.hardlimit.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
It doesn't really matter which distro you use for gaming, just get one that is popular and well-supported such as Kubuntu or Fedora or Pop!_OS or whatever. Ones like Arch and Gentoo would be pretty complicated so I wouldn't recommend those until you feel comfortable.