example

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){

  $('#piza').click(function(){

      $('#ss').hide();
      $('#ns').hide();
      $('#ps').fadeIn();
  });
   $('#salad').click(function(){

      $('#ps').hide();
      $('#ns').hide();
      $('#ss').fadeIn();
  });
   $('#noodle').click(function(){

      $('#ps').hide();
      $('#ss').hide();
      $('#ns').fadeIn();
  });

});
</script>
</head>
<body>


<button id="piza">pizaa</button>
<button id="salad">salad</button>
<button id="noodle">noodle</button>

<p id="ps">pizaa section</p>
<p id="ss" style="display:none;">salad section</p>
<p id="ns" style="display:none;">noodle section</p>
</body>
</html>