title: Why I have too many packages inside my node_modules?
body: <p>I am new, and when i first created my app based on the documentation using npm create-react-app i found it there were a lot of package included inside folder node_module when i code and i only use react and react DOM and etc from the basic.</p>
  
  <pre><code>node_modules
   acorn
   timer
   ansi
   and many more
  </code></pre>
  
  <p>I wonder if anyone can help my how to understand each use inside the node_module or where can i find the documentation for each use?</p>
  
  <p>or how can i just reduce to what i want to use only to decrease the app size?</p>