A content management system (CMS) is an essential tool for website editors to manage their content without requiring technical expertise, providing a quick overview of the content's status and enabling business operations beyond just web page content. The evolution of CMSes has led to the development of decoupled and headless models, allowing developers to work independently with frontend code without affecting the site's backend logic. This tutorial demonstrates how to create a JavaScript CMS app using Contentful's Content Management API, utilizing Node.js and Express.js, and explores various routes for managing content types, fields, editing interfaces, and retrieving spaces created in an organization.