What "no experience" really means on a student CV
Most students who say they have no experience mean they have never had a paid job with a contract and a payslip. That is a much narrower thing than experience. Employers who hire students and school leavers know exactly who they are hiring, and they are not expecting a career history. What they want to see is evidence that you can turn up, learn quickly, work with other people and finish what you start. You have almost certainly done all of those things already; they just happened in a seminar room, a sports hall or a community centre instead of an office.
The job of a first CV is to translate that evidence into the language of work. A group presentation becomes "presented our findings to a seminar group of 30". Helping at a school open evening becomes "guided visiting families around the site and answered their questions". Running a society's Instagram account becomes "planned and posted weekly content for the society's events". None of this is exaggeration. It is describing what you did with the precision an employer needs to judge it.
So before you write a single line, make a long, messy list. Go through your time at university and the last couple of years at school or college, and write down every module, assignment, project, club, role, award, volunteering shift and bit of casual work you can remember. You will cut most of it later, but you cannot choose your best evidence until it is all in front of you.