title: Npm start doesnt work after I create a react app
body: <p>I'm following a youtube react tutorial and what I did was npx create-react-app my-app  Once this was done I cd'ed into my-app and tried to npm start like the tutorial showed. <br>I got an error saying 
  <em>-npm ERR! missing script: start</em> <br>
  I also saw that the person in the tutorial had a public and a source folder. I only have the node_modules folder and package-lock.json and package.json. Why am I missing the public and source folders and why cant I npm start?</p>