I am so new to Firebase (a couple of hours only) and still trying to absorb most of its concepts. I followed the documentation but still found no direct answer to my questio
Traditionally, you would create a /users node in Firebase that contains any other info you want to store about that user.
Use the uid (user_id) as the node name for each user.
users
uid_0
name: "Bill"
food: "Pizza"
uid_1
name: "Ted"
food: "Tacos"
This question has been asked before so please try searching for questions similar to yours before asking.
A bit more info here Firebase Users Node