app-routing.module.ts

const appRoutes: Routes = [
{
  path: 'home', 
  component: HomeComponent, 
  data: { title: 'Home ' }
},
{
  path: 'contact',
  component: ContactComponent,
  data: { title: 'Home ' }
},
{
  path: 'about',
  component: AboutComponent,
  data: { title: 'Home ' }
},
{
  path: '',
  redirectTo: '/home',
  pathMatch: 'full'
},
{
  path: '**',
  component: PageNotFoundComponent
}
];