One set of characteristics often implies other character qualities. A character who enjoys listening to a Brahms violin concerto may also know Rembrandt’s Night Watchmen. Someone who grew up on a farm may possibly know something about repairing a tractor and read weather patterns. A successful stockbroker may possibly know something about banking in Europe.
All this may seem obvious but many times characters are defined only in one way. There are mothers who don’t react to a child crying, Brazilians who don’t react when they hear someone speaking Portuguese.
Your characters have a life outside the story. They come to the story with interests and experiences. Even if you don’t show it, knowing this helps you build a richer story.