SharePoint Sites for Updates for both On-Premise and Cloud

The following are three good sites to use for updates for both on-premise and cloud SharePoint versions:

SharePoint updates - Office release notes:

https://learn.microsoft.com/en-us/officeupdates/sharepoint-updates

What's new in SharePoint:

https://support.microsoft.com/en-us/office/what-s-new-in-sharepoint-02449ef0-027e-4089-8717-f0ae7ea58029

SharePoint News and Insights | Microsoft 365 Blog:

https://www.microsoft.com/en-us/microsoft-365/blog/product/sharepoint/?sort-by=newest-oldest&date=any