The Shapeoko wiki is compatible with this sort of thing, and there actually is a nascent Hobbyist CNC Machining wikibook:
https://en.wikibooks.org/wiki/Category:Book:Hobbyist_CNC_Machining
There is however:
which is available as an ebook at least on the Kindle:
and I know there’s a follow-on which is available in fascicle (occasionally it has been provided to folks who have asked for additional assistance).
I actually found a very promising series of public domain texts which I was planning on copying into the wiki and reformatting:
https://wiki.shapeoko.com/index.php/Books#Online_public_domain
Anyone who wants accounts on the wiki has only to ask for them — the concern here is that Carbide 3D wants control over what’s available for the machine — ideally everything you’d need to know would be on: docs.carbide3d.com — and the wiki started out for the SO1/2 and is more inclusive than a new text would need to be (though of course one would wonder if one should include the Nomad or no).
The other issue then becomes what format should the book be done in — my suggestion would be as a Jupyter Notebook — I actually got started on one for feeds and speeds a while back:
https://colab.research.google.com/drive/1uqRD28E_T_3h4ZR2fU-DM54-T2g3wkG8
which I should get back to. Part of the problem there is the presentation wasn’t as high tech as I was able to manage at:
https://public.tableau.com/profile/willadams#!/vizhome/Carbide3DCNCFeedsandSpeeds/Sheet1?publish=yes
(see: Tutorial on feeds and speeds )
which I found frustrating.