Being more familiar with the topic definitely doesn't always make your prompts better. For a lot of things it doesn't really change (explain X, compare X and Y...) - and this is what is being discussed it. For giving "building" instructions (like writing code) it helps a bit, but even if you know exactly what you want it to write, getting it to do that is pretty much trial and errror (too much detail makes it follow word-for-word and produce bad code, too little and it misses important parts or makes dumb mistakes).