Use of Folders within WordPress

There are no “folders” in the CMS as the content is stored in a set of database tables, unless your site is created with the content inside the templates and not the content editor.

A parent -> child page structure is possible and easy to organize. Simply assign the second level pages to a common parent for organizing as you detail in your question.

There is a good explanation of that relationship in the documentation here: https://wordpress.com/support/pages/page-options/