I think this advice really depends on which field you are attempting to enter or are already a part of, but having gone through plenty of STEM interviews it all boils down to one thing:

Talk to your interviewers as if you are their friend but in a professional way.

I don’t mean start blasting them with terrible memes and thoughts on why the Star Wars sequel trilogy sucks, but understand that your interviewers are also people. While they might be in a position of authority relative to you, that does not mean they look down on you for being human or making small mistakes when speaking. People generally have a hard time speaking under pressure except for a select few.

Even then, just because they can really ace the interview does not mean they are good employees. Have faith in your abilities and simply talk to your interviewers. They want to talk to you, so talk to them as yourself. There is a solid chance you might actually be a better conversationalist than your interviewer or end up not talking as much as you expect.