Generally I agree with everyone else, Linux Mint is great.
However, if you really want to not worry at all, you could just buy a laptop from e.g. Tuxedo or System76. They come with Linux preinstalled (I think in the case of Tuxedo at least, you even have a choice of which Linux Distro?), and are guaranteed to have no hardware “difficulties” with Linux, i.e. even if you put another distro on it, you won’t encounter driver issues.
(Those have become very rare anyways, but do put a damper on the “Firsttime Linux Experience” if you do encounter them…)
Yeah. Everytime I’m for a visit, I have to show my mom again how to copy/paste things, access files on her USB drive, where to click to do an update,…
But she loves Bitwarden. Has been app consistent in using random passwords for logins, both on desktop and mobile.