<app-header></app-header>
<app-sidebar></app-sidebar>
<router-outlet></router-outlet>

--app
  ---header
     header.components.ts
  ---footer
     footer.components.ts

  ---pages
     ---dashboard
        dashboard.modules.ts
        ---create
           create.components.ts
        ******other pages
     ---product
        product.modules.ts
        ---list
           list.components.ts
        ******other pages

  ---shared
     ---dropdownDirective
        dropdownDirective.ts

  app.module.ts