Kind of related: I find the "Mail servers' reference card" at https://www.debian.org/Bugs/server-refcard not helpful at all. I expect a reference card to briefly describe each command that is used in day-to-day operations; instead, the Debian Bugs one just lists (all?) commands and their synop- sis, but /not/ what they do, neither does the list of "bug submission and followup addresses".
I find myself constantly cycling through three or four pages on debian.org and browsing through source code to (in the end) /guess/ what I need to do to achieve something.