How do you comfort girls when they cry? (Break up, hurt feelings, etc...)

Yeah another question by me. How do you stop to make a girl cry? From a relationship, or if their feelings were hurt or any other reason why they would cry. I’m never really good at that stuff I just give them a hug and say it’s going to be okay. I never know what to say after that either. I just stay silent. Try not to hammer with questions. Not good at that. Help?