Live Demo: Creating Custom Template for Bootstrap 4 Tooltips

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Creating Custom Template for Bootstrap 4 Tooltips</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js"></script>
<style>
	.bs-example{
    	margin: 200px 100px;
    }
    .bs-example a{
        margin: 25px;
        font-size: 20px;
    }
    /* Styles for custom tooltip template */
    .tooltip-head{
        color: #fff;
        background: #000;
        padding: 10px 10px 5px;
        border-radius: 4px 4px 0 0;
        text-align: center;
        margin-bottom: -2px; /* Hide default tooltip rounded corner from top */
    }
    .tooltip-head .glyphicon{
        font-size: 22px;
        vertical-align: bottom;
    }
    .tooltip-head h3{
        margin: 0;
        font-size: 18px;
    }
</style>
<script>
$(document).ready(function(){
    $("#myTooltips a").tooltip({
        template : '<div class="tooltip"><div class="arrow"></div><div class="tooltip-head"><h3><i class="fa fa-info-circle"></span> Tool Info</h3></div><div class="tooltip-inner"></div></div>'
    });
});
</script>
</head>
<body>
<div class="bs-example"> 
    <div id="myTooltips">
        <a href="#" data-toggle="tooltip" title="Open this document for editing in a text editor."><i class="fa fa-edit"></i></a>
        <a href="#" data-toggle="tooltip" title="Save this document on the remote web server on a permanent basis."><i class="fa fa-save"></i></a>
        <a href="#" data-toggle="tooltip" title="Download this document from the remote server."><i class="fa fa-download"></i></a>
        <a href="#" data-toggle="tooltip" title="Print this document using a printer installed on your machine."><i class="fa fa-print"></i></a>
        <a href="#" data-toggle="tooltip" title="Delete this document permanently."><i class="fa fa-trash"></i></a>
        <a href="#" data-toggle="tooltip" title="Document Settings"><i class="fa fa-cog"></i></a>
    </div>
</div>
</body>
</html>

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Creating Custom Template for Bootstrap 4 Tooltips</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js"></script>
<style>
    .bs-example{
        margin: 200px 100px;
    }
    .bs-example a{
        margin: 25px;
        font-size: 20px;
    }
    /* Styles for custom tooltip template */
    .tooltip-head{
        color: #fff;
        background: #000;
        padding: 10px 10px 5px;
        border-radius: 4px 4px 0 0;
        text-align: center;
        margin-bottom: -2px; /* Hide default tooltip rounded corner from top */
    }
    .tooltip-head .glyphicon{
        font-size: 22px;
        vertical-align: bottom;
    }
    .tooltip-head h3{
        margin: 0;
        font-size: 18px;
    }
</style>
<script>
$(document).ready(function(){
    $("#myTooltips a").tooltip({
        template : '<div class="tooltip"><div class="arrow"></div><div class="tooltip-head"><h3><i class="fa fa-info-circle"></span> Tool Info</h3></div><div class="tooltip-inner"></div></div>'
    });
});