how to add tooltip in bootstrap 4 code example

Example 1: bootstrap 4 tooltip

<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="top" title="Tooltip on top">
  Tooltip on top
</button>
<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="right" title="Tooltip on right">
  Tooltip on right
</button>
<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="bottom" title="Tooltip on bottom">
  Tooltip on bottom
</button>
<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="left" title="Tooltip on left">
  Tooltip on left
</button>
<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-html="true" title="<em>Tooltip</em> <u>with</u> <b>HTML</b>">
  Tooltip with HTML
</button>

Example 2: bootstrap tooltip

<!-- Bootstrap 5 Tooltips -->
<button
   type="button"
   class="btn btn-secondary"
   data-bs-toggle="tooltip"
   data-bs-placement="top"
   title="Tooltip on top"
>
   Tooltip on top
</button>
<button
   type="button"
   class="btn btn-secondary"
   data-bs-toggle="tooltip"
   data-bs-placement="right"
   title="Tooltip on right"
>
   Tooltip on right
</button>
<button
   type="button"
   class="btn btn-secondary"
   data-bs-toggle="tooltip"
   data-bs-placement="bottom"
   title="Tooltip on bottom"
>
   Tooltip on bottom
</button>
<button
   type="button"
   class="btn btn-secondary"
   data-bs-toggle="tooltip"
   data-bs-placement="left"
   title="Tooltip on left"
>
   Tooltip on left
</button>