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ng generate component user-profile
or with standalone flag
ng g c user-profile --standalone

This creates the component class, template, styles, and spec file.

@Component({
  selector: 'app-user-profile',
  standalone: true,
  imports: [CommonModule],
  template: <section>
    <h1>{{ user.name }}</h1>
    @if (user.bio) {
      <p>{{ user.bio }}</p>
    }
  </section>,
})
export class UserProfileComponent {
  @Input() user!: User;
}

export class CounterComponent {
  count = signal(0);
  increment() {
    this.count.update(v => v + 1);
  }
}

Signals integrate with the new change detection flow for fine-grained updates.

With standalone components, import dependencies directly. With NgModules, declare them in a shared or feature module.

@Injectable({ providedIn: 'root' })
export class ApiService {
  constructor(private http: HttpClient) {}
}

providedIn: 'root' creates a single app-wide instance that is tree-shakeable.

@Component({...})
export class UsersComponent {
  private api = inject(ApiService);
  users = signal<User[]>([]);
}

The inject() function is the modern alternative to constructor injection.

const API_URL = new InjectionToken<string>('API_URL');
{ provide: API_URL, useValue: 'https://api.example.com' }

export const routes: Routes = [
  { path: '', component: HomeComponent },
  {
    path: 'users',
    loadComponent: () =>
      import('./users/users.component')
        .then(m => m.UsersComponent),
    children: [
      { path: ':id', component: UserDetailComponent },
    ],
  },
  { path: '**', component: NotFoundComponent },
];

export const authGuard: CanActivateFn = () => {
  const auth = inject(AuthService);
  return auth.isLoggedIn || createUrlTreeTo('/login');
};

Functional guards are the modern, injectable form.

export const userResolver: ResolveFn<User> = (route) =>
  inject(UserService).get(route.paramMap.get('id')!);

provideRouter(routes,
  withPreloading(PreloadAllModules))

Preloading improves perceived performance by loading lazy bundles during idle time.

@Component({
  changeDetection: ChangeDetectionStrategy.OnPush...
})

OnPush limits checks to when inputs change or events fire within the component.

items = signal<Item[]>([]);
computed total = computed(() =>
  this.items().reduce((s, i) => s + i.price, 0));

Signals let Angular know exactly which views depend on which data, skipping unaffected subtrees.

Use loadComponent and loadChildren to split the initial bundle. Only the code needed for the first view loads on startup.

@for (item of items(); track item.id) {
  <app-item [item]="item" />
}

Tracking by a stable identity prevents Angular from re-creating DOM nodes unnecessarily.

Use pure pipes for expensive formatting. Wrap costly computations in computed signals so they cache until inputs change.

npm install -g @angular/cli
ng new my-app --routing --style=scss
cd my-app
ng serve

ng generate component dashboard
ng generate service services/data

Wire the service into the component with inject() and render data with the new control flow.

Define routes with loadComponent for code-split feature areas. Add guards for protected views.

Run ng test for unit tests. Add Cypress or Playwright for E2E coverage of your critical flows.

Enable OnPush, adopt signals, set bundle budgets, and build for production with ng build --configuration production. Deploy to your host of choice.