I quickly learned that as a fiction writer, you need the sort of details a historian or a biographer would find extraneous or useful to provide context via a footnote.
I always stretch after working out or training and then again before going to sleep. It keeps the muscles healthy and useful, reduces risk of injuries, and is a great way to wind down.
I do chat to my mother in Norwegian, particularly when we want a secret conversation. It is useful that way.
When you're a houseguest and you leave, it's nice to straighten something up or send your hosts a useful gift. And when you leave the planet, it's nice to have made a positive contribution.
President Trump should be considered to be a useful idiot and a fellow traveler, which makes him an unwitting agent of Putin.
There are games where the striker will be useful for the team in terms of creating space and being involved in the game, without necessarily scoring, but he'll have played an important role for the team. But, of course, over the course of a season, I have to score goals, as that's what statistics reflect.
Two important characteristics of maps should be noticed. A map is not the territory it represents, but, if correct, it has a similar structure to the territory, which accounts for its usefulness.