[CraigJPerry]

Reveal.js is low overhead for this use case - create a stack of vertical slides (overhead is typically just an opening and closing html tag for each section of your guide) and use the javascript api to toggle overview mode on when the page loads (1 line overhead plus open and closing script tags).

I know you should typically use reveal for presentations but the overview mode and print to pdf feature are pretty usable for guides.

I like it primarily for the low overhead, but it has decent support for low-lighting irrelevant lines when presenting code (my typical use case) and i can use markdown for text and because it’s pure text in git, i find it easy to share with others when there’s collaboration needed.