gistfile1.txt

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { AboutusComponent } from './aboutus/aboutus.component';
import { ContactusComponent } from './contactus/contactus.component';
import { HomeComponent } from './home/home.component';
import { PortfolioComponent } from './portfolio/portfolio.component';
import { ShowcaseComponent } from './showcase/showcase.component';

const routes: Routes = [{
    path: '',
    component: HomeComponent
  },{
      path: 'contactus',
      component: ContactusComponent
  },{
      path: 'aboutus',
      component: AboutusComponent
  },{
      path: 'portfolio',
      component: PortfolioComponent
  },{
      path: 'showcase',
      component: ShowcaseComponent
  },
  {
    path: '**', redirectTo: ''
  }
  ];

@NgModule({
  declarations: [
    AboutusComponent,
    ContactusComponent,
    HomeComponent,
    PortfolioComponent,
    ShowcaseComponent
  ],
  imports: [RouterModule.forRoot(routes)],
  exports: [
    RouterModule
  ]
})
export class AppRoutingModule { }

COSI EVITI 
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';

import { AboutusComponent } from './aboutus/aboutus.component';
import { ContactusComponent } from './contactus/contactus.component';
import { ContactsComponent } from './contacts/contacts.component';
import { PortfolioComponent } from './portfolio/portfolio.component';
import { ShowcaseComponent } from './showcase/showcase.component';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent,
    AboutusComponent,
    ContactusComponent,
    PortfolioComponent,
    ShowcaseComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

E IL AppModule viene

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }