Taksim square is a twenty minute drive from the center of Istanbul, and the Istiklal street around 15 to 22 minutes. The distance between these two areas you’ve walked at is seven to ten minutes by car.
Istanbul is not the capital of Turkey 🇹🇷, even though it’s a 100% important city of Turkey 🇹🇷. From the capital which is Ankara, it’s about five to six hours from there.