What you should not do at all:

It may be obvious to some, that most of the things you should not do are the opposite of what you should. However, some people need reinforcing.

If an employer asks "Do you know about ....? and you do not, say No. If you say yes, the next question is almost always "Tell me about it."

Chew gum during the interview is tacky and inappropriate. I would recommend that you do not before the interview either as you may forget to remove it.

Do not smoke, even if the interviewer does and offers you a cigarette. .

Don't ever refuse a job offer until you have had the time to think about it. It may be the only one you get.

Make sure your answers are short and to the point.