Best method to set different layout for different pages in angular 4

I am new to angular 4. What I'm trying to achieve is to set different layout headers and footers for different pages in my app. I have three different cases:

routes: ['login','register']

Marketing site page (this is the root path and it has a header and footer, mostly these sections come before login)

routes : ['','about','contact']

App logged in pages (I have a different header and footer in this section for all the app pages but this header and footer is different from the marketing site header and footer)

routes : ['dashboard','profile']

I run the app temporarily by adding a header and footer to my router component html.

Please advise me a better approach.

This is my code:

app\app.routing.ts

   const appRoutes: Routes = [
        { path: '', component: HomeComponent},
        { path: 'about', component: AboutComponent},
        { path: 'contact', component: ContactComponent},
        { path: 'login', component: LoginComponent },
        { path: 'register', component: RegisterComponent },
        { path: 'dashboard', component: DashboardComponent },
        { path: 'profile', component: ProfileComponent },


        // otherwise redirect to home
        { path: '**', redirectTo: '' }
    ];

    export const routing = RouterModule.forRoot(appRoutes);

app.component.html

<router-outlet></router-outlet>

app/home/home.component.html

<site-header></site-header>
<div class="container">
    <p>Here goes my home html</p>
</div>
<site-footer></site-footer>

app/about/about.component.html

<site-header></site-header>
<div class="container">
    <p>Here goes my about html</p>
</div>
<site-footer></site-footer>

app/login/login.component.html

<div class="login-container">
    <p>Here goes my login html</p>
</div>

app/dashboard/dashboard.component.html

<app-header></app-header>
<div class="container">
    <p>Here goes my dashboard html</p>
</div>
<app-footer></app-footer>

I saw this question on stack-overflow but i didn't get a clear picture from that answer

You can solve your problem using child routes.

See working demo at https://angular-multi-layout-example.stackblitz.io/ or edit at https://stackblitz.com/edit/angular-multi-layout-example

Set your route like below

const appRoutes: Routes = [
    
    // Site routes goes here 
    { 
        path: '', 
        component: SiteLayoutComponent,
        children: [
          { path: '', component: HomeComponent, pathMatch: 'full'},
          { path: 'about', component: AboutComponent }
        ]
    },
    
    // App routes goes here
    { 
        path: '',
        component: AppLayoutComponent, 
        children: [
          { path: 'dashboard', component: DashboardComponent },
          { path: 'profile', component: ProfileComponent }
        ]
    },

    // no layout routes
    { path: 'login', component: LoginComponent},
    { path: 'register', component: RegisterComponent },
    // otherwise redirect to home
    { path: '**', redirectTo: '' }
];

export const routing = RouterModule.forRoot(appRoutes);

you can use child e.g.

const appRoutes: Routes = [
    { path: '', component: MainComponent,
        children:{
            { path: 'home'  component:HomeComponent},
            { path: 'about', component: AboutComponent},
            { path: 'contact', component: ContactComponent},
               ..others that share the same footer and header...

        }
    },
    { path: 'login', component: LoginComponent },
    { path: 'register', component: RegisterComponent },
    { path: 'admin', component:AdminComponent, 
         children{
            { path: 'dashboard', component: DashboardComponent },
            { path: 'profile', component: ProfileComponent }
               ..others that share the same footer and header...
         }
    }
    { path: '**', redirectTo: '' }
];

MainComponent and AdminComponent like

<app-header-main></app-header-main>
<router-outlet></router-outlet>
<app-footer-main></app-footer-main>

the post talk about separate in diferent files the routes