Azure

Portal
https://portal.azure.com

Azure Migration Center
https://azure.microsoft.com/en-us/migration/

Azure Migration White Paper
https://azure.microsoft.com/en-us/resources/choosing-your-database-migration-path-to-azure/

Supported Version & Edition Upgrades

2017
https://docs.microsoft.com/en-us/sql/database-engine/install-windows/supported-version-and-edition-upgrades-2017

2016
https://docs.microsoft.com/en-us/sql/database-engine/install-windows/supported-version-and-edition-upgrades

2014
https://technet.microsoft.com/en-us/library/ms143393(v=sql.120).aspx

2012
https://technet.microsoft.com/en-us/library/ms143393(v=sql.110).aspx

Supported Features

2017
https://docs.microsoft.com/en-us/sql/sql-server/editions-and-components-of-sql-server-2017

2016
https://docs.microsoft.com/en-gb/sql/sql-server/editions-and-components-of-sql-server-2016

2014
https://msdn.microsoft.com/en-us/library/cc645993(v=sql.120).aspx

2012
https://msdn.microsoft.com/en-us/library/cc645993(v=sql.110).aspx

2008-R2
https://msdn.microsoft.com/en-gb/library/cc645993(v=sql.105).aspx

2008
https://msdn.microsoft.com/en-us/library/cc645993(v=sql.100).aspx

Build Versions

https://sqlserverbuilds.blogspot.co.uk/

https://sqlserverupdates.com/

Functions

https://www.w3schools.com/sql/sql_ref_sqlserver.asp