Lists

Tag Purpose
<ul> Unordered list (bullets)
<ol> Ordered list (numbers)
<li> List item (used in both ul and ol) 
<ul>
  <li>Apple</li>
  <li>Banana</li>
</ul>

<ol>
  <li>First</li>
  <li>Second</li>
</ol>

Tables

Tag Purpose
<table> Defines a table
<tr> Table row
<th> Header cell (bold & centered)
<td> Data cell 
<table>
  <tr>
    <th>Name</th>
    <th>Age</th>
  </tr>
  <tr>
    <td>John</td>
    <td>25</td>
  </tr>
</table>