bazzite seems to be so crucial for widespread adoption, watching with great interest!
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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.
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Honestly though, most actual non-techie users just need a web browser and the odd desktop office application.
For people who have never used a command line interface, and who would have no idea what to do with one anyway, you really can't much more straightforward than something like Bazzite or Bluefin.