Working on a different topic than your advisor
Do you select a topic for your PhD which your supervisor is an expert in? What if your supervisor is not an expert in your topic, how do you deal with it? Are you looking for a different supervisor/university? If you continue with your supervisor, do you get feedback from other people in your research area? How to get in contact with people in your research area which are not in your department?
I'm currently in the situation that I'm working on a different topic than my supervisor and would like to discuss the situation with people who might are in a similar situation.