Reminds me of an acronym that defines this sort of behaviour: COIK.
What is COIK? well everyone knows what COIK is, no need to bother explaining.
COIK is 'Clear Only If Known.' Did you really have to ask me about such a simple thing? Now run along.
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There is so much assumed knowledge that writing guides becomes a matter of how simple you have to go, before you start insulting the reader's intelligence. (A computer is a magic box that goes DING!)
If you writing a guide, do you explain what a terminal is and where to find it? Or do you presume they know what it is and start sharing command lines? Is setting a minimum knowledge bar acceptable or are you showing your bias?
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Obligatory XKCD: