Most people have had great answers coming from the company side of things. I’ll take it from the standpoint of individuals like us helping someone linux curious see the light, while still having the “just works” experience.
Do not give them any choices. None. Put them on your stable distro of choice for a new user, call whatever that is “Linux”, and be on your way.
But why? Isn’t that antithetical to everything we value? Yes and no. We value choice almost above anything else, but that doesn’t “just work” for most people. Which of those do you value more?