After an interview, try to write down all the questions that were asked and how you answered them. Take time to consider how you would answer them differently, and things to note for future interviews. Also, within the first 24 hours of the interview, send a detailed and genuine email to the person who interviewed you to thank them for their time and reiterate your interest in the position. If you haven’t heard back from them by the date they specified, feel free to send them a polite email to check-in on their progress and reiterate your interest.