It is difficult to study brain development in infants because

A baby's head isn't fully developed and so trying to study a infants brain could damage their head and brain

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p