If you know someone well, start with your similarities. Students talk about the canteen teacher, and schoolmates talk about the math exam. Colleagues don't ask about the work content, and competitors are easy to handle. It's best to be caring and attentive at ordinary times, help bring breakfast every day and send her home at night. Such frequent hints, talk to her about some trivial things in life, set her hobbies and share your own stories. If she has feelings for you, seize the opportunity to express her feelings. If she's still lukewarm after a while, let's be together.
If you are a strange girl, you should say hello just because her appearance interests you. There is a process of understanding. I want to make friends with that lively girl. If she is interested in you, she will leave her contact information. If she is not interested, you don't have to waste time. Say hello to your friends and leave. No one will laugh at you. If you are a quiet-looking girl, you should pay attention to your manners, and don't say anything about beautiful women, then it will become the scene of a car accident.
So to sum up, we should talk about different topics according to different situations. Boys should read more books, watch more news and pay more attention to some current affairs and entertainment news, so that girls will not be embarrassed when chatting with you. The most important thing is that no matter what kind of girls, they should be polite. It is necessary to say hello.