Additional SQL Server features and topics not covered by specific categories
Hi,
SQL Server is a relational database management system mainly used on Windows (SQL Server 2017 supports Linux), it is closely related to Windows in all aspects. From installation and startup, connection(windows authentication)&certification and encryption, management and maintenance, etc., including various HA technologies,sql server failover cluster, availability groups.
In addition to the basic concepts, you need to actually understand all aspects of SQL Server according to your needs.
https://learn.microsoft.com/en-us/sql/sql-server/?view=sql-server-ver15