Applied for an internship but not sure what to do next.. guide me

Hi everyone, recently I completed my 2nd year and from some days I was doing leetcode (30 questions till now) so I got over excited and applied for an internship in a company through unstop app, I had a Udemy Web developer bootcamp course and I hadn't completed it then so I just ticked all the video to be complete so that I can get the certificate to put on my resume and I also added all the skills I was going to learn from that course, however I didn't add any projects but still got shortlisted for interview. Now please tell me I am confused and scared if I should even attend the interview or not as I am afraid that the interviewer might ask me questions that I don't have any idea of (like if he asks me about node, express or mongodb, etc)? What will I do then. I know html, css and javascript only and I have a good command on c++ and some data structures.