I wrote some documentations for my clients and other nontechnical users to use as a reference after their initial training, available at
http://websitezen.com/modx-revolution-client-documentation.
The documentation is free under the Creative Commons Attribution license; you can modify it, distribute it, and even sell it, as long as you give me credit for the original. It is not required, but I would appreciate an optional link to the original document or to my website (
http://websitezen.com).
I wrote this reference because all of the existing MODX documentation that I found had too much information on elements, site setup, and other complex areas that might intimidate or confuse nontechnical users. If you know of any similar documentation that I missed, let me know or post a link to it here.
Suggestions, feedback, and corrections for the documentation are welcome. If you send me your Google email, I will give you comments access to the document in Google Drive.