jQuery Add

<!DOCTYPE html>
<html>
<head>
    <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
</head>
<body style="font-family: sans-serif; padding: 20px;">
    <ol id="daftarMateri">
        <li>HTML5</li>
        <li>CSS3</li>
    </ol>
    <button id="btnTambah">Tambah Item Materi</button>

    <script>
        $('#btnTambah').click(function() {
            $('#daftarMateri').append('<li>JavaScript & jQuery</li>');
        });
    </script>
</body>
</html>