[TeMPOraL]

PC gaming in general is an experience, not knowledge.

However, specific niches of PC gaming are a different thing. There's a myriad of subreddits focused on narrow things like assembling gaming PCs, evaluating GPUs, playing a particular game, modding a particular game, etc. Many of those have a knowledge-generating nature, and among them plenty are maintaining Wiki pages, so that valuable knowledge is not lost (and so that the same questions aren't being asked a hundred times a day).

In general, this is the case with many (most?) subreddits focused on topics that have a knowledge component - be it a hobby like woodworking, a specific diet, a support group for specific mental issue, etc. Where tools for it are present, people maintain knowledge bases, for their own reference as well as to let newbies get up to speed without flooding the group with questions.