Upgrade Paths for CU’s & .NET
https://eightwone.com/2017/12/21/upgrade-paths-for-cus-net/
The Most Recent Updates for Microsoft SQL Server
https://sqlserverupdates.com/
Exchange Server build numbers and release dates
https://docs.microsoft.com/en-us/Exchange/new-features/build-numbers-and-release-dates?view=exchserver-2019
SharePoint updates
https://docs.microsoft.com/en-us/officeupdates/sharepoint-updates