Certain MS documentation is actually incredible. For instance, the docs for the Win32 API are some of the best out there, rich with notes, examples, warnings, links to relevant topics. For instance, here's the page for CreateWindowEx: https://docs.microsoft.com/en-us/windows/win32/api/winuser/n.... Having never written Win32 code before, I was able to get a window open complete with simple rendering from a bitmap backbuffer in about two hours using nothing but those docs.

Most of the more recent library documentation they have is not great though -- seems like autogenerated junk, mostly.