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247 questions
If you installed SQL Server Developer Edition on your laptop, you can give any of a single dot, localhost or the name of the machine. This assumes that you followed the defaults when you installed.
If you installed SQL Server Express Edition with the defaults, you need to specify the instance name after the server name, so it would be any of .\SQLEXPRESS, localhost\SQLEXPRESS, MACHINE\SQLEXPRESS.
If you are in a corporate network, you will to talk to your manager, your DBA or an IT person to learn what is the name of the server.
If you only downloaded and installed SQL Server Management Studio, you also need to download and install SQL Server. Or sign up for a database in Azure.