Building digital products requires providing co-workers with a way to edit content, which can be challenging when using traditional CMS systems that are not scalable or compatible across different platforms. The solution lies in serving structured JSON rather than HTML, enabling cross-platform portability and scalability. A headless or API-first CMS provides a complete content infrastructure, allowing for setup of content structures, understanding of content management as building blocks, creation and editing of reusable content structures, connection of content structures into a graph, separation of concerns, and preview mechanisms to enable safe editorial workflows. Additionally, the CMS should provide solutions to script content changes at scale, integrate with other software-as-a-service products, and notify other parts of the infrastructure when content is added or deleted. A scalable cached API, preview API, write or management API, and webhook integration are essential features for a successful content infrastructure.