The simplest thing to do when faced with a situation you don’t understand is to admit that you don’t understand it. But, it’s difficult too. Maybe you feign knowledge of the subject matter, demurring to a new topic as soon as possible. Maybe it’s worse than that. What seems difficult to do for many is to admit, “I don’t know.”
But it shouldn’t be that hard. We have narrow fields of expertise, and there’s nothing wrong with that. Nothing wrong with admitting this is beyond your expertise.