We have 2 kinds of documents for Ravada : MarkDown and reStructuredText.
MarkDown (md) files are the default for github documents. It is used for files stored in the code branches of Ravada.
This is a guide for the github markdown flavour.
You can view it before commit with the MarkDown Preview Google Chrome extension
reStructuredText (rst) files are used for the advanced documentation of Ravada that you can find in our readthedocs web site
You can read more about rst files at the docutils rst
The Google Chrome MarkDown Preview extension is supposed to render rst files too but it lacks some features like remote links. It is better to render those files with RestView.