Settings -> System -> Notifications. Scroll to the bottom, expand Additional settings. Uncheck "Suggest ways to get the most out of Windows and finish setting up this device" and "Get tips and suggestions when using Windows".
I get more prompts from macOS about Apple products than I get from Windows about Microsoft products after unchecking those two settings.
Even more true now than it has been in maybe 100 years.
I did uninstall all of the weird apps like "News" "Weather" etc.