The purpose of peer feedback is to receive constructive criticism of your essay. Your peer reviewer is your first real audience, and you have the opportunity to learn what confuses and delights a reader so that you can improve your work before sharing the final draft with a wider audience (or your intended audience).
It may not be necessary to incorporate every recommendation your peer reviewer makes. However, if you start to observe a pattern in the responses you receive from peer reviewers, you might want to take that feedback into consideration in future assignments. For example, if you read consistent comments about a need for more research, then you may want to consider including more research in future assignments.