We already know that we have to add every component to the app.module.shared.ts file's import list and declarations array, so we won't explain how to do it again; let's just do it as we already did a number of other times.
While we're there, let's add the missing routes as well to the RouterModule, just after the quiz ones:
[...] { path: 'quiz/create', component: QuizEditComponent },{ path: 'quiz/edit/:id', component: QuizEditComponent },{ path: 'quiz/:id', component: QuizComponent },{ path: 'question/create/:id', component: QuestionEditComponent },{ path: 'question/edit/:id', component: QuestionEditComponent },{ path: 'about', component: AboutComponent },[...]
We can easily note a big difference between the quiz/create ...
