Check out example codes for "nested list html". It will help you in understanding the concepts better.

Code Example 1

<!-- Creat a list inside list -->

<ul>
  <li>Coffee</li>
  <li>Tea
    <!-- nested list -->
    <ul>
      <li>Black tea</li>
      <li>Green tea</li>
    </ul>
  </li>
  <li>Milk</li>
</ul>

Code Example 2

<ul>
  <!-- main item list -->
  <li>Coffee</li>
  <li>Tea
    <ul>
      <!-- items nested under tea -->
      <li>Black tea</li>
      <li>Green tea</li>
    </ul>
  </li>
  <li>Milk</li>
</ul>

Learn ReactJs, React Native from akashmittal.com