The guide describes customizing the Strapi admin panel to integrate Idyll support into its markdown-rich text editor, aimed at enhancing the editor's functionality with interactive article creation capabilities. Idyll, an open-source markup language and toolkit, allows embedding JavaScript within text and enables collaboration among programmers, journalists, researchers, and designers. The process involves setting up a Strapi instance, installing necessary dependencies, and creating mirror folders to override specific files of Strapi's content-manager plugin. The guide details adding a dropdown for Idyll components within the editor and implementing preview functionality that supports both Idyll and markdown. It offers step-by-step instructions, including creating necessary folders, copying files, and modifying code, culminating in rebuilding and running the application to reflect the changes. The author, Daryl, a seasoned software developer, provides additional resources for further customization and encourages experimentation and learning through this hands-on approach.