How to greet neighbors?

I think if you want to say hello to your neighbor, and he is a female neighbor, I think you can ask him something, knock on the door and ask him something, or you can contact him in some ways. After all, greeting him is from unfamiliar to familiar, and it can only be established by actively greeting him. After all, it's because you two also need a way to establish communication. If he is at home all the year round, he also has time for you. After all, it is possible that he belongs to the kind of introverted person who doesn't want to go out, so you can also make him feel that it is actually beautiful outside in your own way.