I am not sure if this document from EASA has yet been posted in any of the discussions. This is the Acceptable Means of Compliance (AMC) and Guidance Material (GM) for UAS operations in Open & Specific Categories. This document gives clear guidance on the Remote Pilots (RP) responsibilities without getting lost in EU or CAA aviation legal terminology.
And this is the AMC & GM for EASA Commission Implementing Regulation (EU) 2019/947 known as the IR
There is already a very large thread on EASA rules, I have posted this here so as not to get lost in such a large discussion.