...If you've previously installed create-eth-app globally via yarn global add create-eth-app, we recommend you uninstall the package using yarn global remove create-eth-app and use the yarn create eth-app shorthand to ensure that you use the last version. When you’re ready to deploy to production, create a minified bundle with yarn run react-app:build. You’ll need to have Node 14 or later version on your local development machine (but it’s not required on the server). You can use nvm (macOS/Linux) or nvm-windows to switch Node versions between different projects. You'll also need Yarn on your local development machine. This is because Create Eth App relies on Yarn Workspaces, a feature not supported by Npm.