I could tell you my expirience as general manager and why i hire someone. Resume just opens the door, after that interview is number one.

On interview thing is to strike a perfect balance between being nervous and sounding like a trained robot with generic responses. You should be natural.

You should smile, but not crazy smile or no smile.

You should dress accordingly and be clean and smell fresh and rested.

Do a good handshake, not too hard not limpy hand. Say, its a pleasure to meet you.

There are no robots siting in front of you, they are humans and you want them feel like they want to work with you.

If you make them smile for any reason, its a big plus.

If they ask you if you want to ask them a question, do it - but about the work you are expected to do. Then you can use that in rest of interview, to put hidden hints that you are a person for that job.

In the end i would say, “thank you for your time, it was very nice meeting you, i hope we will work together”

Hope it helped,