A friend said he would go to your house for dinner, of course you should reply to him. You are always welcome. You can also ask him what he likes to eat. Do you have any special requirements? Some people may have something they don't eat, which is also possible, and as a host, this should be asked clearly. Since we want to treat people, we must satisfy them. So you should ask him what he is afraid of eating. For example, some people are afraid to eat beef, so don't buy beef. If he says whatever, then you can cook for him according to your own meaning. It is not easy for a friend to come. So try your best to entertain him. I think it is the best way to entertain guests.