Avoid using slang and other fillers like "um" or "like" and try to be professional and maintain a respectful tone and maturity.
Saying this shows your lack of problem-solving skills and uncertainty, so try to show a willingness to learn and ask for clarification.
Avoid asking salary ,benefits during the interview and instead ask about this after you receive any mail or letter regarding the job.
never say to the interviewer "It's on my CV" even if you have provided the whole info on it and try to always expand your experiences and skills to showcase your personality.
always research the company before going for the interview and never ask about the company's mission and values.
Not asking questions in the interview shows your lack of interest, so always try to prepare some thoughtful questions about the company before the interview to show a genuine interest.
While interviewing, be confident with your skills, and ability to learn, and never focus on what you lack.