The phrase "lack experience" means not having enough knowledge or practice in a particular area or activity. It implies that someone has not been exposed to or had enough opportunities to learn and gain skills in a specific field. Full definition
These are the students who lack experiences in making sense of and solving problems, and in communicating and using precise, appropriate mathematics and mathematics language. (edutopia.org)
Sales professionals who lack experience with medical sales, B2B industries, or other high value equipment may make up for it with their passion. (medreps.com)
So does knowledge; some newly separated men lack experience of caring for children alone. (fatherhoodinstitute.org)