====== Adding Router to App ======
===== Add the Routing Module =====
app-routing.module.ts will be add to project with the following code:
<code>ng generate module app-routing --flat --module=app</code>

===== Add Component for Routing to =====
Add a component for the router to route to. Here we have a component called ''mycom''. A sub-directory with the component files will be generated under the directory src/app/.
<code>ng generate component mycom</code>

===== Route to a Component =====
In app-routing.module.ts, add 
<code>
const routes: Routes = [
  { path: 'mycom', component: MycomComponent }
];
</code>
so that the file becomes:
<code>
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import {Routes} from "@angular/router";
import {MycomComponent} from "./mycom/mycom.component";

const routes: Routes = [
  { path: '', redirectTo: '/mycom', pathMatch: 'full'},
  { path: 'mycom', component: MycomComponent }
];

@NgModule({
  declarations: [],
  imports: [
    CommonModule
  ]
})

export class AppRoutingModule {
}
</code>

===== Update the app.component.html =====
Set it as follow so that it will route the page according to the url.
<code>
<router-outlet></router-outlet>
</code>
When your URL is http://xxx.yyy:4200/mycom, the MycomComponent will show up.

Assume we have two other components called info and another, we can add the routes to our router module, and then do:
<code>
<a routerLinkActive="active" routerLink="info">info</a><br/>
<a routerLinkActive="active" routerLink="another">another</a>
<router-outlet></router-outlet>
</code>