Powell 365, affectionately called "Paolo", is a site manager for SharePoint.
The purpose of this documentation is to ease the developer experience of Powell 365. As of this writing (2023/01/19), official Powell documentation could be a bit more specific. While official training videos do exist:
as well as a learning center (email Powell for access), this form of training is not especially helpful for developers building SharePoint sites using Powell.
Instructions for contributors can be found here.