Some things take a lot of practice to master, but you’ve probably heard of people who seem to require no practice at all, who are extremely talented, perhaps from a young age. You might describe such a person as a “prodigy.” A prodigy is someone who excels at doing something, and is often used in the term “child prodigy” to describe an amazing talent in a very young person.
Example: “Wolfgang Amadeus Mozart was a true musical prodigy: he began playing keyboard at age three and writing music at age five, and by the time he was fourteen years old, his operas were being performed to great success.”