How much knowledge do you guys know about the industry that you work in?

Like if you go into the oil and gas industry, are you expected to know a bit about the technical side of things? What about banking, aeronautics, maritime, etc? I imagine you must have an overview of the industry and how it works but how detailed does that need to be beforehand? And during your work do you learn a lot more about the more technical/detailed aspects of the industry and its processes?

banking cybersecurity etc gas industry knowledge maritime oil oil and gas technical things work