As a structural-functionalist, Durkheim believed that

Society is a complex system of interrelated and interdependent parts that work together to maintain stability (Durkheim 1893), and that society is held together by shared values, languages, and symbols. ... Each of these social facts serves one or more functions within a society.

This sounds like a personal reflection on something you did. it is asking the hardest part, or a part you may have struggled with on an informal interview you must have done. it is also asking advice you'd give someone else for the process of completing an informal interview, so you should write something that would . for example, maybe the first thing they should do, something they should include.