Create a user & grant that user to a specific Database

--Step 1: (create a new user)

create LOGIN hello WITH PASSWORD='foo', CHECK_POLICY = OFF;

-- Step 2:(deny view to any database)

USE master;

GO

DENY VIEW ANY DATABASE TO hello;

 -- step 3 (then authorized the user for that specific database , you have to use the  master by doing use master as below)

USE master;

GO

ALTER AUTHORIZATION ON DATABASE::khsk_db TO hello;

GO