Custom fields can be created on user records, along with custom links that appear on user detail pages. To navigate to the user field's page, go to Setup | Customize | Users | Fields and then scroll down to the User Custom Fields section:
The user object can be considered as a special object in Salesforce as there are restrictions on what can be configured. For example, there can be only one record type and page layout for the user object.
Let's discuss the health check feature present in Salesforce.
