1npx create-react-app my-app
2cd my-app
3npm start

1npx create-react-app app-name
2cd app-name
3npm start

1npm i npx
2npx create-react-app my-app
3cd my-app
4npm start

1npx create-react-app my-app
2cd my-app
3yarn start

1npx --ignore-existing create-react-app .