The problem is that it is very frustrating to navigate there. For example, here is the Erase your Mac section: Erase your Mac - Apple Support.
There is no option to quikly reveal it in the table of contents, because TOC is, by default, collapsed, and you need to expand each chapter to see what is inside:
But even if I expand all the sections there, there is no “Erase your Mac” among them.
Is there a normal good-old book instead, that is PDF or EPUB?
When I click on this link: macOS User Guide - Apple Support (from your initial post), and then enter the word “erase” in the search field at the top of the page this is what I see: