How do you put it, what is correct?
"have an idea and qualification of/in what they're talking about"
I don't really see what you are getting at with "idea and qualification". "to have an idea of what they're talking about" means to know or understand roughly what they are talking about. , that they are talking about maths, and you have, say, a degree in maths.
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I don't really see what you are getting at with "idea and qualification".
"to have an idea of what they're talking about" means to know or understand roughly what they are talking about.
"to have a qualification in what they're talking about" presumably means, e.g., that they are talking about maths, and you have, say, a degree in maths. Or they are talking about medicine and you a