I'm not that guy, but the Wikipedia article[1] is a decent jumping-off point, but I also found this blog article[2] talking about the different versions-- although it seems to get a couple things wrong according to discussion about it on lobste.rs[3] Finally, this long article from Another Boring Topic [4] includes several great sources.
The Lobsters discussion was very interesting. Some people in there were extremely knowledgeable, but also very confrontational. Coming straight in going "that's all wrong!" is not a productive way to start a discussion IMHO.
I didn't get any very firm conclusions from it. There are some very knowledgeable people out there on the WWW claiming, with convincing arguments, that Windows/286 couldn't run in 286 mode and only gave you 640kB ("conventional memory" in DOS terminology)+ 64kB HMA.
Others, including from Microsoft, say no, Windows/286 did run in protect mode and could access 16MB of (segmented) RAM.
1 - https://en.m.wikipedia.org/wiki/Windows_2.0#Release_versions
2 - https://liam-on-linux.livejournal.com/78006.html
3 - https://lobste.rs/s/4xfswa/what_was_difference_between_windo...
4 - https://anotherboringtopic.substack.com/p/the-rise-of-micros...