A core feature of any social media platform is the ability for users to interact with shared content. For the posts that are created in the MERN Social application, we will add the options to like and leave comments on individual posts.

To complete the implementation of this feature, first, we will have to modify the backend so that we can add API endpoints that update an existing post with details of who liked the post and details of comments left on the post.

Then, in the frontend, we will have to modify the UI so that users can like and leave a comment on a post.