Understanding @input – from parent to child

I try to learn Angular and now I’m at the @Input stage.

I have a main app and a child component. In app.component I have a test variable. I want to pass this variable from app.component.ts to child.component.ts.

export class AppComponent {
test = 10;

export class AppComponent {
@Input() fromParent: number;
  childVar = fromParent + 5;
} //this should to show 15 in console...

Now, how can I do this?
Thank you very much !!!

Source: Angular

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