The Linux Documentation Project has been around for 20+ years:

https://tldp.org/

Its history is here: https://tldp.org/history.html

It is not obvious to me if the two projects have different goals.

Is tldp still being maintained ? Last update seems to have been in 2020 based upon the main page.

I wish GNU and Linux took a page from OpenBSD, if a command is changed, a man page is created that contains all information we need. Instead we have many sources of information, all with different info.

The git repo has some more activity.

https://github.com/tLDP/LDP

There is still a lot of old information though, that doesn't necessarily apply the same way today. It would be nice to see more activity updating stuff.

The one true source of man pages on Linux:

https://www.kernel.org/doc/man-pages/maintaining.html

This appears to be a long abandoned documentation project (last update was 2007).

Yeah, but it's F/OSS, so anyone can fork it

Came here to comment exactly that.

So happy to finally find good documentation on this! https://www.linfo.org/faster_dial-up.html

Ah, I miss the days of dial up internet (not just on Linux) ... :-)