Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Bootstrap 101 Template</title> <!-- The title of the Website -->
<!-- Reference to Bootstrap's CSS file -->
<!-- This is the line to reference the bootstrap's Stylesheet -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!-- [if lt IE 9] -->
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<!--[endif]-->
</head>
<body>
<h1>Hello, world!</h1>
<!-- Referencing jQuery (necessary for Bootstrap JavaScript plugins(bootstrap.min.js) to work) -->
<script src = "https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Referencing Javascript Bootstrap Plugin to Facilitate Bootstrap Animations and functionalities. -->
<!-- (Necessary to run Bootstrap) -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
