React-Beginning

npm init -y
npm i --save react react-dom
npm i -D babel-core babel-loader babel-preset-es2015 babel-preset-react react-hot-loader webpack webpack-dev-server
npm i -g webpack webpack-dev-server(one time)

---------Nov 25-----------
[1] each render() return JSX syntax html which is how we want this component looks like after state got changed.
[2] React re-renders the components all the way down beginning at the component that contains the render] which means that
    React re-renders only components below the component that changed, and not the entire app.