yarn create & npx & npm init
https://www.npmtrends.com/npm-vs-npx-vs-yarn
demo
https://www.npmjs.com/package/create-react-app
$ yarn create react-app
$ npx create-react-app
$ npm init react-app
https://create-react-app.dev/docs/getting-started/#creating-an-app
yarn create
css & dark theme
https://create-react-app.dev/docs/getting-started/#creating-an-app
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