Angular’s template syntax:

• [property]="expression": set property of an element to the value of expression
• (event)="statement": execute statement when event occurred
• [(property)]="expression": create two-way binding with expression
• [class.special]="expression": add special CSS class to element when the value of expression is truthy
• [style.color]="expression": set color CSS property to the value of expression

If you’re not familiar with Angular’s template syntax, you should definitely read the official template syntax documentation.