Don’t smoke, even if the interviewer does and offers you a cigarette. And don’t smoke beforehand so that you smell like smoke. Do brush your teeth, use mouthwash, or have a breath mint before the interview.
Do avoid using poor language, slang, and pause words (such as “like,” “uh,” and “um”).
Don’t be soft-spoken. A forceful voice projects confidence.
Do have a high confidence and energy level, but don’t be overly aggressive.
Don’t act as though you would take any job or are desperate for employment.
Do avoid controversial topics.
Don’t say anything negative about former colleagues, supervisors, or employers.
Do make sure that your good points come across to the interviewer in a factual, sincere manner.