<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h2>Learning jQuery</h2>
<h1>This is a heading</h1>
<h3>This is also heading</h3>
<p>This is a paragraph.</p><br>
<p>This is another paragraph.</p><br>
<button type="button" class="btn btn-success 1">Click me to hide paragraphs</button>
<button type="button" class="btn btn-success 2">Click me to hide little headings</button>
<button type="button" class="btn btn-success 3">Click me to hide big headings</button>
</div>
</div>