*ngIf: Conditionally includes or excludes an element from the DOM:
<div *ngIf="isVisible">This will show conditionally</div>
<div *ngIf="user; else noUser">Welcome {{user.name}}</div>
<ng-template #noUser>Please log in</ng-template>
*ngFor: Repeats an element for each item in a collection:
<li *ngFor="let item of items; index as i; trackBy: trackByFn">
{{i}}: {{item.name}}
</li>
*ngSwitch: Conditionally displays one element from several possibilities:
<div [ngSwitch]="condition">
<p *ngSwitchCase="'A'">Case A</p>
<p *ngSwitchCase="'B'">Case B</p>
<p *ngSwitchDefault>Default case</p>
</div>