Following users in MERN Social

In MERN Social, users will be able to follow each other. Each user will have a list of followers and a list of people they follow. Users will also be able to see a list of users they can follow; in other words, the users in MERN Social they are not already following. In the following sections, we will learn how to update the full-stack code to implement these features.

Following and unfollowing

In order to keep track of which user is following which other users, we will have to maintain two lists for each user. When one user follows or unfollows another user, we will update one's following list and the other's followers list. First, we will update the backend to store and update these...