How to store values such as name and mobile when create user with email and password Firebase? React Native

can somebody explain and give example on how to store extra data when crate user with firebase9? I can only create user with email and password. But how to add data such as name, image, etc? There is a function add data? but this is in firebase database which is separate from authentication. It gets different document id, and thus, I can not linked it to a specific user?
Please some clarification how to save additional data when creating a user with firebase 9 and where and how to read that data?