step 2

first-app/src/app/app.ts

@@ -3,9 +3,7 @@ import {Component} from '@angular/core';
 @Component({
   selector: 'app-root',
   imports: [],
-  template: `
-    <h1>Hello world!</h1>
-  `,
+  templateUrl: './app.html',
   styleUrls: ['./app.css'],
 })
 export class App {