Ask HN: End-of-life planning while young?

Is there a standard recommendation for basic end-of-life planning, like a will, that everyone should have in place as an adult?

The thought crossed my mind while I was rotating some passwords in my password manager recently. I remember reading a post on here a while back about someone suddenly losing their spouse and the documents they wished they had taken care of, but I couldn't find it. I am a single, healthy 30-year-old so this is not anything I am expecting to happen soon. That said, I am wondering if there is any guidance here.