In this example there are two divs, you have the div with the class of “parent” and the div with the class of “child”. Notice how the ending div </div> for the parent div comes after the child div. This is what it means to nest, the child div is now nested inside of the parent div.
So the directions say
" Within the div.question-block elements, nest one label element, and give the label elements text content"
This is the .div-question-block
<div class="question-block">
</div>
Inside here you need to nest a or put in a label element, and give that label some text.