In the early days of React, a common complaint in the community was that the lack of tooling was detrimental to the developer experience. Fortunately, an officially supported boilerplate has been created since then and is now provided with a CLI to allow customizations. By boilerplate, we mean a default project structure, with configuration, build scripts, and so on.
CRA is React's tool of choice. With it, you can easily scaffold new React applications. In essence, it is similar to the Vue and Angular CLIs, but doesn't go the extra mile like the Angular CLI does (for example, it doesn't support scaffolding UI components).
The official website of CRA can be found here: https://create-react-app.dev.
Applications created with CRA come with batteries included. They incorporate a modern build system that uses Webpack...