SQL Server 2016 Security for beginners: Logins, Users, Roles and GRANT/DENY Permissions

What is a difference between SQL User and Login?
How to CREATE Server Login and SQL Database User?
How to CREATE and why do you need Fixed Server/Database Roles?
How to CREATE a User-Defined Role?
How GRANT/DENY permissions/roles to Login on database object (e.g. table)?
How DROP Login and User?

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