অ্যাঙ্গুলারজেএস ng-app

<!DOCTYPE html>
<html ng-app="app">
<body>

  <div ng-controller="app">
    <h1>{{header}}</h1>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
  <script>
    angular.module("app", []);

    angular.module("app")
      .controller("app", function($scope) {
        $scope.header = "প্রোগ্রামিং শিখুন";
      });
  </script>

</body>
</html>