When creating a new Blazor server side app with individual user acounts, it's common to want to add additional properties and link tables to the user logged in such as user profile information, If you have never done this before it's not obvious since Blazor hides away a lot of the internals of the authorisation and injects the views at runtime for registration etc.
This post explains how to set up individual user authentication and add additional properties linked to the the ASPNetUsers table
The following post is an introduction into MonoGame, why you should use it and a little history.