<html>

  <header>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
  </header>
  
  <body>
    <h1>IMPORTANT TITLE <b>BOLD</b></h1>
    <h1 id="abc">TITLE 2</h1>
    <h1 class="c1">TITLE 3</h1>
  </body>
  
  <script>
  	alert('Hello');
    
    alert($('h1').html());
    alert($('#abc').text());
    alert($('.c1').text());
    
    $('.c1').html('NEW TITLE');
    
    $("h1").each(function(index) {
      alert(index + ": " + $(this).text());
    });
    
    $('#abc').remove();
  </script>

</html>