ng container and ng template code example
Example 1: ngTemplate
<div *ngIf='name && lastName; then thereAreParams else thereArentAnyParams'>
</div>
<ng-template #thereAreParams>
<h2>Name is : {{name}} </h2>
<h2>Last name is : {{lastName}} </h2>
</ng-template>
<ng-template #thereArentAnyParams>
<h2>There aren't any parameters</h2>
</ng-template>
Example 2: ng-container vs ng-template
<div>
Pick your favorite hero
(<label><input type="checkbox" checked (change)="showSad = !showSad">show sad</label>)
</div>
<select [(ngModel)]="hero">
<ng-container *ngFor="let h of heroes">
<ng-container *ngIf="showSad || h.emotion !== 'sad'">
<option [ngValue]="h">{{h.name}} ({{h.emotion}})</option>
</ng-container>
</ng-container>
</select>