how to make a table onhtml

<table style="width:100%">
 
<tr>
    <th>Firstname</th>

    <th>Lastname</th> 
    <th>Age</th>

 
</tr>
 
<tr>
    <td>Jill</td>

    <td>Smith</td> 
    <td>50</td>

 
</tr>
  <tr>
    <td>Eve</td>

    <td>Jackson</td> 
    <td>94</td>

  </tr>
</table>