While Implementing Angular Universal. It is not loading inside <router-outlet>

Neither It’s loading for ng serve loading only
<app-root _nghost-sc0="" class="ng-tns-c0-0" ng-version="7.2.2" ng-non-bindable=""><section _ngcontent-sc0="" class="web_homePage"><router-outlet _ngcontent-sc0="" class="ng-tns-c0-0"></router-outlet></section></app-root> for sudo npm run build:ssr && npm run serve:ssr.
Kindly help me out. let me know about the other requirements do i need to share.

Source: AngularJS Questions