It's truly wonderful that there are so many resources like this available these days.

Overviews like this with lots of links to other topics, with the relationships to the main topic made clear, and with little insights scattered throughout were particularly useful to me as a learner.

In the 90s, before the web really took off, stuff like this was hen's teeth. Anything you found, via BBS, Usenet, or the nascent web, you'd pore over in detail and make sure to fastidiously back up in case you never found it again.