Never answer a question with a question. Don't allow the interviewer to put words in your mouth. This is a trap. Answer questions using your own words so that anything that is quoted is your statement, not what they were trying to elicit. Never exaggerate the facts.
Most interviewers are sensitive to what they perceive as puff.
Understatement is always the best policy. Actually, the truth is the best policy. Before or after an interview, be wary of engaging in friendly conversations. These are usually designed to provide them with more information than you are prepared to provide at the time. It is also another way to get you to give them exclusive quotes.