Exercise:

Disable the first item in the list.
Hint: Use the .disabled class.
<!DOCTYPE html>
<html lang="en">
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="../../maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="../../ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="../../maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <div class="list-group">
    <a href="#" class="list-group-item disabled">First item</a>
    <a href="#" class="list-group-item">Second item</a>
    <a href="#" class="list-group-item">Third item</a>
  </div>
</div>

</body>
</html>