I think the easiest way is to ask the question “what does my character know about it?” In a lot of ways, it rests in the hands of the DM and how the world is described, how NPCs interact with them, and what information is provided.
I have a player at my table that has a high-charisma character, though the player is…lacking in social graces, shall we say. And as a DM, I’ll admit, it’s hard to remember it when he’s making all these gaffes and generally being a boor.