how to user tooltip in bootstrap code example

Example 1: bootstrap button tooltip

<!-- Bootstrap button Tooltip 
You can look here for in depth info: 
https://getbootstrap.com/docs/4.0/components/tooltips/

OR use the bellow example : -->
<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="top" title="Tooltip on top">
  Tooltip on top
</button>

Example 2: bootstrap tooltip on dynamic element

$("body").tooltip({
    selector: '[data-toggle="tooltip"]'
});