If you like a coffee shop owner who is also a martial arts instructor, how can you find a topic to chat with him?

You can start by talking about the way the coffee shop is run, including his love for martial arts. Such a person has both a petty bourgeois side and a macho side, so the content of your conversation should be in these two aspects, and should be related to each other. Then you can describe yourself to the coffee shop owner and the other party. These two different attitudes of the martial arts coach are displayed in front of him. You can show a certain degree of admiration and admiration for him, but you must not belittle yourself.