First impressions are important, so prepare thoroughly for an interview. Dress professionally, arrive early, greet the interviewer with a firm handshake while making eye contact. Learn about the company and be ready to discuss your qualifications. Ask relevant questions and maintain a positive, confident demeanor throughout. Follow up after the interview with a thank you note to reinforce your interest in the position. Proper preparation and following basic etiquette can help make a strong, lasting first impression.