I wonder what kind of person you are as an American friend? All the Americans I meet are much more casual than I thought. I was formal at first, but I found that Americans don't pay as much attention to etiquette as I thought.

If this is your first visit to his house.

You can say when you meet.

Hi, nice to meet you! Hi, nice to meet you! (Just say hello when you meet)

Thank you for inviting me over! Thank you for inviting me to your home.

If he shows you around his house, praise him.

What a beautiful house! /I like your apartment!

When eating, if you can't, learn from others.

But if you can't use a knife and fork well, tell them.

Sorry, I'm not good at using knives and people.

He may teach you and won't laugh at you.

Besides, Americans hold some bread in their hands. People hold it in their hands, so you don't have to fork it ~ ~

When eating, if they talk, you can also talk, just tell others.

It's delicious! /It's delicious! The former is more colloquial.

Say it again when you leave.

Thank you very much for inviting me!

I had a great time!

The food is great, too!

Almost ~ ~

I know it seems a little late to answer now, because Thanksgiving is over, but I hope it will help you deal with them in the future.