How to create a list of lists in html code example

Example 1: how to get number list in html

<ol>
<li>Example</li>
<li>Example2</li>
<li>Example3</li>
</ol>

Example 2: list item nesting html'

<li>List Item</li>
        <li>List Item</li>
        <li>
          List Item
        </li><ul>
            <li>List Item</li>
            <li>List Item</li>
          </ul>