When to load AngularJS

First Page
<!DOCTYPE html>
<html>
   <body>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
      </script>
      <div ng-app="myApp" ng-controller="myCtrl">
         {{ firstName + " " + lastName }}
      </div>
      <script>
         var app = angular.module("myApp", []);
         app.controller("myCtrl", function($scope) {
         $scope.firstName = "Ali";
            $scope.lastName = "khan";
         });
      </script>
      <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
   </body>
</html>
Output

First Page