^^ Most applicants to Harvard have committed themselves to a few extracurricular activities at their high school (1-4 activities that show a keen interest in something beyond classroom academics), but they are not necessarily skilled or talented. Think: Sports writer for their school newspaper, yearbook staff, debate member, choir or band member, cheerleader, class president, sports participant (but not at a Division 1 recruited athlete level), robotics club, etc.
However, every year there are several hundred accepted students who have huge talents and skills – and those students might range from a concert quality musician, famous actor, Intel Science winner, a 17-year Broadway playwright, to a computer science wiz-kid who sold his game in high school for millions of dollars (yes, those types of kids do exist). Here’s one article about one of those very skilled and talented students, but as I said before, MOST accepted students do NOT have these kind of talents or skills. What they demonstrate in their application is commitment, dedication and devotion to something they love. The key words are “commitment and dedication” as selective colleges believe that commitment and dedication are transferrable skills that might be applied to another extracurricular activity in college or something later on in life: https://www.fastcoexist.com/1681325/what-happens-to-genius-kids-after-they-win-the-google-science-fair.