List all built-in structural directives

The main built-in structural directives in Angular are:

1. *ngIf - conditionally displays an element in the DOM.
2. *ngFor - repeats an element for each item in a collection.
3. *ngSwitch, *ngSwitchCase, *ngSwitchDefault - displays one of several variants depending on the value of an expression.

Conclusion: these directives control the DOM structure by adding, removing or selecting elements to render.