You will feel most relaxed

You will feel most relaxed and comfortable if you just allow yourself to enjoy expressing yourself as you would in any situation.

Just one more hint: Mirror your interviewer’s rate and style of speech. If you match your rate of speech to the speed of the interviewer’s speech, your interviewer will unconsciously feel more of a rapport with you. Most of the time you will not need to do this, but if you get a real fast talker or a real slow drawler, that person will tend to feel more comfortable with you if you are closer to his or her rate of speech. Practice this with a friend or with someone you meet, and see how this matching technique will help you to feel more at ease.

Before we move on to salary negotiation, let’s make sure you’ve mastered the interviewing ingredients to get a top offer! Take a moment to test your readiness with this checklist. If you can check every box, you’re an interviewing pro!

I know that the best strategy for answering straightforward questions is to tell stories with specifics and to use Q statements to highlight my skills, personal traits, competencies, and accomplishments.
I’ve done some research on the company so I know which of my attributes to emphasize during the interview.
I can answer the question, “What do you know about our company?”

Taken from : Fearless Interviewing - How To Win The Job