One nice thing about Ubuntu (a flavor of Linux) is that you can boot from the installer into the Desktop. So you can test everything out like Wifi, trackpad, ethernet, graphics and so on. If everything doesn’t work nothing is lost. Just note that it will be slow since the OS is on a USB drive.
But if Ubuntu works once installed it is fairly easy. My moms Luddite roommate has ran Ubuntu for about 6 years and I have only had to help him twice.
My mom runs Windows 10 and I have to help a bit more. But it isn’t nearly as bad as back in the 2000Pro days. That was daily phone calls.
Perhaps the best thing about Linux is updates generally don’t require rebooting. I have uptime on Linux boxes over a year that are completely patched.