Tool which can use to create react app
with some basic React code
most importantly a bunch of configuration files which help build that React app for production use
⇒ it turns out that there will be a couple of transformation and optimization steps between developing and running a React App in production
→ simplified development process
it tells React where this React Application (this user interface, which you build with React in the end)
→ Index.html
<div id=”root”></div>
root.render(<App/>)
JSX stands for JS XML
JSX is not support in the browser
when check dev toll — you should see some static/JS
exact number and names of these files might differ
→ it hold whole package code (include library code)