“If you wish to improve, be content to appear clueless or stupid in extraneous matters.” – Epictetus
Don’t be a “know-it-all.” It’s only your ego that is standing in the way if you don’t allow yourself to tell someone that you don’t know the answer to a question.
Most of the time, you’re not fooling anyone if you act like you understand something, but really don’t. That will lose you points with whomever you’re talking to. But to say that you don’t know and to be genuinely curious/ask good questions? Then that person will be more likely to want to help you and teach you.
The key here is to ask good questions though. Don’t ask easy questions that can be easily looked up on Google. You should do research on the subject if you don’t know about it, learn the basics, and then ask questions to “the expert.” If you are asking basic questions for basic ideas, you are wasting their time. And if they’re truly an expert, they will get annoyed that you’re asking questions that should not require their attention.