title: Difference between npm start and npm run start
body: <p>I have checked both commands <code>npm start</code> and <code>npm run start</code>, both works perfectly. I used create-react-app. But to make configuration changes in the CSS module, I run <code>npm eject</code> but it throws an error.</p>
  
  <p>But <code>npm run eject</code> worked? I'm confused on why <code>npm eject</code> didn't work. Can I configure this?</p>
  
  <p>Below is my <code>package.json</code>:</p>
  
  <pre><code>  "scripts": {
      "start": "react-scripts start",
      "build": "react-scripts build",
      "test": "react-scripts test --env=jsdom",
      "eject": "react-scripts eject"
    }
  </code></pre>