This hints at a more general problem: how does one gather a high-quality repository of knowledge on any given subject? How do you get enough stuff? How do you keep the noise down? I believe some subjects make the problem harder than others. Programming for instance is full of hard to check claims. Even established techniques are hard to assess. Say you need to parse stuff. Will you go recursive descent? LALR? Earley?…
Some examples...
See "guilds" https://en.m.wikipedia.org/wiki/Guild
See "companies" with "trade secrets".
See Vatican Library (no longer fully secret) https://en.m.wikipedia.org/wiki/Vatican_Library
See "classified information" https://en.m.wikipedia.org/wiki/Classified_information