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Mithical here - the other documentation lead along with [Sigma](https://meta.codidact.com/posts/283321/283401#answer-283401).

A couple notes on this suggestion:

Separating network vs. community help: I like that idea. As Sigma mentioned, there are a couple difficulties when we have help pages such as asking / answering guidance that both have similarities across the network but do have customizations on individual communities.  
We'd probably wind up putting those along with the per-community help.

You suggest a flagging help page. Good idea; that is an oversight, and we could do with a page explaining how it works, what the different types of flags are, etc., more in-depth than the flagging dialogue.  
This also runs into the per-community customization issue, though; different communities have different reasons for - as an example - closing questions. For users who can't yet vote to close, flagging is how that happens, but the guidance on flagging to close will differ on every community.

Answering guidance has the same problem. I considered writing a page for it, but eventually abandoned the idea because I figured that it'd need to be so specialized per-community that a network-wide outline might not even be useful. That can definitely be revisited, though.

You say the Categories (/help/articles) page is obsolete. How? I took a quick scan through it, and aside from the URL slug, the information seems to be largely still accurate, although yes, it could stand to explain how it relates to the different tabs in the header. I'm happy to fix anything obsolete there, but I'm having a hard time telling what you think is obsolete.

There are a couple specialized help pages such as the referencing one you mention, and the alt text help.

The alt text help is linked whenever you submit a post containing an image without alt text. It contains a brief explanation of why alt text is important and how to add it; it's useful as an independent help page for that linking usage.  
The referencing help page exists for a similar reason, as well as the promotional guidance - for being linked to. I don't honestly expect anyone to sit down and read the Help Center unless they're __extremely_ bored. It's more useful to link somebody to a page specifically about what's being talked about rather than a wall of text with a section about the relevant issue.

The suggestions are appreciated, by the way; we're always looking for ways to improve. :)