More than one. Truth be told, I have a lot of notions. The “opinion,view,orbelief” kind, the “a fanciful or foolish idea; whim” and the “ingenious article or device” kind. Mostly I have a lot of the sewing-quilting kind of notions.
You probably use one more than you’d like, and most of us don’t use the other as much as we could. One is necessary to have, the other is beneficial. Both help with piecing beautiful blocks and quilts.