Express named instance issues

If you have just installed an instance of SQL Server Express, and used a Named instance instead of a Default instance, so you must remember that it will be mandatory to inform the instance name right after the Server name field when loggin in (see picture below), or in another situation, like creating a database via script. The path to the database changes from MSSQLSERVER to SQLEXPRESS.

Using a named instance, instead of default bring some little bit differences when using SQLServer