npm init (initializing the npm in our app, it will create a package.jon file in our app). npm install -D parcel (install the parcel as a dev depnedency package) "parcel": "^2.12.0", here ^ if you used ^ symbol it will install latest minor version of the package. here ~ if you used ~ symbol it will install latest major version of the package. npm install will recreate the entire nodemodules (noneed to push the node modules into the github).
npm install react (npm i react) npm install react-dom (npm i react-dom)