A couple of weeks ago, there was a good article over at engadget.com by Steve Dent that reviewed the current state of camera technology.
Steve reviews the state of DSLRs vs. mirrorless vs. compact cameras, sensor technology, video features, and his top picks if you are thinking about buying a camera right now (early 2018).
This is a great camera article for those just getting into real estate photography. Note, this article is about cameras only. If you are getting into real estate photography, you have to pay as much, if not more attention to which lenses you need to choose for the camera. For recommendations in that area see the PFRE Lens page.