<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<div>
 
Name : <input type="text" />
<h1>Hello {{name}}</h1>
</div>

Some quick notes

• must be within ng-app
• can specify default value with ng-init
• ng-model to define value to be displayed later in place holder
• use double curly braces as place holder to display value hold by ng-model