Beaglebone Green most updated technical documents

Does anybody could tell me where to find updated technical documentation of Beaglebone green?
I have been looking for that in https://docs.beagle.cc/ which I think should be a kind of “official” site but I did not find anything. The most updated doc I found in other websites is a BeagleBone Green System Reference Manual from Oct 9, 2015.
Many thanks!