1. It's best to bring three resumes with you when interviewing (it's recommended to wrap them with a transparent cover, and the paper can be thicker and have a better texture) and put them in your bag (if possible, don't use a schoolbag, just take a computer bag with a better texture) for backup. Generally speaking, HR personnel will ask you for your resume, but the interviewer doesn't ask. You can keep the rest for yourself, and finally familiarize yourself with your resume before the interview.
2. Call you for an interview, depending on the situation. If the interviewer is sitting in the room, let you in, don't knock, otherwise it will be silly; If the HR sitting outside lets you in, you can go in directly without waiting for the answer inside, because people are usually ready to go in at this time; In the last case, the HR sitting outside calls you in, and the interviewer is not ready. Wait a little after entering the door, and the interviewer will guide you to sit down.
3. Before going in, prepare a resume for the interviewer. After entering, sit down according to the instructions, smile at you (natural expression, just like smiling at an acquaintance), nod, give your resume to the interviewer, then say hello, signal that the other person is ready and wait for the other person to ask questions.
One more thing: it is not recommended that you take the initiative to shake hands with the interviewer when you go in.
4. The bag you took was put at your feet as soon as you sat down. This is more natural and won't appear stiff.
Finally, be confident and wish you good luck!