As explained in previous challenges, JSX must return single elements. Then, <div></div> is usually used to nest more complex JSX as I understood.
In the code editor of this challenge, for example :
class ParentComponent extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<div>
<h1>I am the parent</h1>
{ /* Change code below this line */ }
{ /* Change code above this line */ }
</div>
);
}
};