To be fair, the new https://docs.microsoft.com site is much better than the old ones, but I know what you mean. I still occasionally get confused at all the .NET nomenclature, and I wrote I book on the topic.

I gave a talk at the London .NET user group earlier this year on why it's all so hard to understand. Maybe it will help clarify some things, however it was before the 2.0 announcement: https://unop.uk/on-asp-net-core-and-moving-targets/