What is the correct way to approach an unknown girl?
There is no real advise on how to approach a girl. You will have to find a way yourself. Be nice and be natural. Don’t make it an awkward situation. Maybe you just walk up to her and tell her that you would like to know her better. Introduce yourself. See that you look neat and clean. Be respectful. If she brushes you off for the first time don’t let your hopes sink. Try again after a few days. Maybe you could buy her some nice flowers. There are many ways. Never be very blunt. Girls always like boys who are little shy. Good luck dear.