>>33565192 (OP)
Just say "deep," but don't worry about being so, just follow your interests.
As to your question, if you are curious and read widely you will naturally be able to have a conversation about anything. If you are talking to someone who is an accredited expert, or even if you are a bit light in your understanding of a field that your interlocutor is interested in, you can ask sensible questions based on what you do know. People love explaining things they are interested in and have a deep knowledge of, and will believe that you are a smart person to be asking such questions.
By the way, if you're short on time, go to your favourite shadow library, search for "very short introductions" and download and read all of them.