Gatsby, recognized as a top technology to learn in 2020, is highlighted for its ability to create websites by sourcing content from various platforms, thanks to its flexible data layer and GraphQL API. As part of the #100DaysOfGatsby challenge, participants are encouraged to make their sites more content editor-friendly by integrating a headless CMS, which enhances the potential of Gatsby projects beyond static Markdown files. The challenge emphasizes leveraging Gatsby's capabilities to easily integrate multiple content sources, such as Airtable, Shopify, Contentful, and PostgreSQL, allowing developers to choose the best tools for their needs without being confined to a monolithic CMS. Resources and community support are offered to assist participants in exploring and experimenting with different CMS integrations, ensuring an enriching learning experience for both beginners and experienced users.