Attribute directives

Attribute directives listen to and modify the behavior of other HTML elements, attributes, properties, and components.

Adding and removing classes with NgClass

...
<p [ngClass]="isSpecial ? 'special' : ''">I am {{'running'}} on port {{port}}</p>
...

...
isSpecial: boolean = true;
...

.special {
  color: deeppink;
}

Task for yourself

• NgSwitch
• NgStyle

Refer here.