Traditionally, an unmarried girl wears a ring on the ring finger of her left hand. This practice is often associated with the belief that the left ring finger contains a vein that runs directly to the heart, known as the "vena amoris."
While this belief is not scientifically proven, it has been a popular tradition for centuries.
However, it is important to remember that ring-wearing customs can vary depending on culture, religion, and personal preference.