TinaCMS is a JavaScript toolkit designed to integrate content editing functionalities into websites, and this guide details how to incorporate it into a Gatsby site. Currently leveraging a Git backend, TinaCMS tracks content changes and updates source files and repositories in real time. The guide provides step-by-step instructions on installing and configuring TinaCMS, including setting up the Tina sidebar, creating content editing forms for markdown, and enabling inline editing for enhanced user experience. It also covers how to add a content-creator plugin for creating new posts and discusses deploying TinaCMS in a cloud environment using Gatsby Cloud, allowing non-technical users to manage content. The article highlights TinaCMS's flexibility, with plans to support alternative backends in the future, and introduces Tina Teams, an upcoming feature for live editing and user authentication.