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Good morning! This screen, is the default login screen to connect to the database, probably when performing the installation of SQL Server Management Studio and SQL, the installation gave you 2 options to login to DB, authentication with windows or the one you choose,
example:
User: user1
Password: 1234
In the authentication field it is possible to change the form of login with the windows authentication itself if you have chosen or the one you defined through a specific user and password
The name of the instance/server you want to connect to, for example: sqlexpress computer. https://docs.microsoft.com/pt-br/sql/ssms/f1-help/connect-to-server-database-engine?view=sql-server-ver15. I recommend reading: http://www.macoratti.net/vbn_ssms.htm
– Valdeir Psr
You can name your machine.
– Eduardo Borges