On an Angular 12 componente I have the following:

export class SignUpComponent implements OnInit {

  environment: Environment;
  form: FormGroup;
  stage: number;

  constructor(
    private router: Router, 
    private title: Title, 
    private formBuilder: FormBuilder, 
    private analyticsService: AnalyticsService, 
    private environmentService: EnvironmentService) { 

    this.environment = this.environmentService.get();

    this.title.setTitle('Registar - Bons Alunos');

    this.analyticsService.pageview('Sign Up', this.router.url);

    this.form = this.formBuilder.group({ 
      email: ['', [Validators.required, Validators.email]]
    });

    this.stage = 1;

  }

  ngOnInit() { }

Question

What should I move from the component's constructor to the ngOnInit method?

What kind of code should I place on ngOnInit that cannot / should not be on the constructor?