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Schema is a logical collection of database object associated with a database such as tables, views, stored procedures, functions, indexes, triggers …
An user of a databses is called a Schema owner. A schema belongs to a single database, and one dabase can have a single or multiple schemas. ` [database].[schema].[table]` Advantages:

• a database, logical collection of database objects associated with a database such as tables, views, stored procedures, functions, indexes, triggers.
• apply security permissions for separating and protecting database objects based on user access rights.
• apply security permissions for separating and protecting database objects based on user access rights.
• apply security permissions for separating and protecting database objects based on user access rights.

SQL Server provides some pre-defined schemas which have the same names as the built-in database users and roles, for example: dbo, guest, sys, and INFORMATION_SCHEMA. The dbo schema is the default schema.

Here, some useful informations on sqlshack and quest

So, step by step and keep learning!