Updated: Feb 6, 2021
First research the company, and the interviewer if you know who he/she is.
Ensure you arrive early at least 15 minutes.
Dress for the position you want.
Ask questions, interviewer's love candidates who are engaged and knowledgeable, it shows you've done your homework, and are more likely to hit the ground running.
Pay a compliment the company, or the physical space.
Always bring several physical copies of your resume to distribute. Never assume they have it digitally for their ease of reference.
Send a follow-up note to thank them for the opportunity
Ask for feedback if not selected.