is that I have a question and it is a bit urgent. I need to do a project in Android Studio where I have a client (id, name), a product (number, product name), the goal is to create these 2 and show them as an invoice, something like showing the typed information on the other side ( type invoice) I managed to more or less solve the problem with SQLite, but now I need to do it with Firebase and I do not know how :( Some help, thank you very much!