I am wondering if there is a word for requesting or requested someone's knowledge of something. This came up in a conversation I was having about car insurance. I had to explain to them that my question did not directly affect me, but I would just like to get to know whatever information or insight they had on the topic. I guess the closest examples I can think of are insight and understanding. But I feel as though both of those give the feeling that there is a secret or not well known portion of the topic. Such as something that would be directly specific to them, rather than universally accepted facts.
An idiom (as specified in the title) used for this is:
'Can I pick your brains?'
pick someone’s brain
to ask someone's advice about a subject the person knows a lot about: Can I pick your brain about how you got rid of those weeds? Cambridge Academic Content Dictionary © Cambridge University Press
Colloquially, we can pump someone (for information), though this normally indicates rather brusque questioning.
"Can you give me the run down on this...?"
You are politely asking for a description of the basic components of something. i.e. the nuts and bolts, the bare bones, the main components that make something up.
After receiving an answer, if you feel that there is more to the subject that you might be missing out on, you might ask follow-up questions. Such as, "What should I watch out for?" or "Is there something specific I should know about this...?", etc.