This example demonstrates how to build a minimal React application that renders a simple greeting message based on a boolean property. The code defines two components, `UserGreetings` and `GuestGreetings`, which display different heading text, with a `Greeting` component intended to conditionally render one of them. Using React 16.10.0 and ReactDOM, the app mounts a root `App` component to a `<div>` with the ID `root`. The example highlights JSX syntax, component structure, and conditional rendering logic within a basic HTML page.