I truly appreciate when someone is honest about what they do not know. I find that people are trying to be the expert on everything, but why? Why not own your ignorance on a subject and strive to learn more about it?
It is very common for my, at work, to say “I don’t know” and go out searching for who might know or how to learn more on the topic.
It is refreshing when people have the confidence to admit they have room to grow still.