Please check the links below. It would help you start off on SQL.
https://learn.microsoft.com/en-us/training/paths/azure-sql-fundamentals/
https://learn.microsoft.com/en-us/training/modules/introduction-to-transact-sql/
https://learn.microsoft.com/en-us/training/modules/introduction-to-sql-server-2022/
https://learn.microsoft.com/en-us/training/modules/get-started-transact-sql-programming/
Thanks.