Requirement

You must have added Angular routing at the app creation
If not, in src/app : ng g module app-routing

app-routing module

This is an example of what it should look like :

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { PageNotFoundComponent } from "./page-not-found/page-not-found.component";
import { HomeComponent } from "./home/home.component";

const routes: Routes = [
  { path: '', redirectTo: '/home', pathMatch: 'full' },
  { path: 'home', component: HomeComponent },
  { path: '**', component: PageNotFoundComponent }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }