I put my partner on fedora, she’s not very techy, and generally speaking she doesn’t really have any issues doing the day to day stuff.
I can second Fedora (the KDE version). It's been rock solid for me, it works with all my hardware both old and new.
The biggest pain point was switching to Firefox and getting its worse profile system to work, but that was not a necessary change just a choice.
One of the biggest pluses for me was the ability to move my Firefox and Thunderbird profiles from one OS to another, over the decades.
You definitely had to take a few minutes out to massage the profile system to get the old profile to show up again (basically figuring out how to point back to the existing moved profile, and not the new one that a new install creates), but it was well worth doing so, for the portability that it affords.