If you're just looking for release notes for each patch cycle, feature update etc, just go here:
https://learn.microsoft.com/en-us/windows/release-health/release-information
If you're looking for email notification for the latest Microsoft security patches, you need to set it up here:
- You can either subscribe to their RSS feed or get an email
Although its great, I would recommend that you subscribe to a technology agnostic notification list for security alerts and patches
- CISA
- SANS Risk
As for as new stuff from Microsoft, try their blogs