This document discusses separating concerns in React components. It provides an example of extracting the dynamic logic from a React component into a separate controller module. This keeps the component focused only on the view logic and renders. The controller module is required by the component and handles any asynchronous behavior or state updates. Separating these concerns improves modularity and makes the code easier to understand and maintain. The example transforms an existing component to use this pattern by moving the dynamic code into a new controller file and augmenting the main component with the controller's methods.