import { NgxSeoModule } from '@avivharuzi/ngx-seo';

imports: [
  // ...
  NgxSeoModule.forRoot(),
],

...
import { NgxSeo } from '@avivharuzi/ngx-seo';

...

const SEO_HOME: NgxSeo = {
  title: 'home page',
  meta: {
    description: 'home page description',
  },
};

const SEO_ABOUT: NgxSeo = {
  title: 'about page',
  meta: {
    description: 'about page description',
  },
};

const routes: Routes = [
  { path: '', component: HomeComponent, data: { seo: SEO_HOME } },
  { path: 'about', component: AboutComponent, data: { seo: SEO_ABOUT } },
];

const SEO_SPECIAL: NgxSeo = {
  meta: {
    customTags: {
      mySpecial: {
        name: 'mySpecial',
        content: 'mySpecial content :P',
      },
    },
  },
};

const routes: Routes = [
  { path: 'special', component: SpecialComponent, data: { seo: SEO_SPECIAL } },
];

...
export class MoiveDetailComponent implements OnInit {
  movie: Movie;

  constructor(
    private movieService: MovieService,
    private ngxSeoService: NgxSeoService,
  ) {}

  ngOnInit(): void {
    this.movieService.getDetails(1).subscribe(movie => {
      this.movie = movie;

      this.ngxSeoService.setSeo({
        title: movie.title,
        meta: {
          description: movie.description,
        },
      });
    });
  }
}

...
NgxSeoModule.forRoot({
  changeTitle: (title) => title,
  preserve: false,
  listenToRouteEvents: true,
})
...