Hi! Could someone explain what FirebaseDB is? Maybe like a tutorial — what it is, how it works, and when to use it. I’m curious 
Do you want to read about Firebase itself, or how AppInventor can interact with Firebase?
I’m interested about Firebase itself
How can it interact with MIT App Inventor? When I add FirebaseDB in the Designer, it says it could change or break in the future.
Much the same as any other component!
Some background for how to interact with Firebase
and Using the REST API and Web component instead of the native firebase component
Can I connect 2 or more phones together with Firebase? (Chat App, a game, a quiz,…)?
Yes you can, that is the whole point of a multi user online database.
So, one of the phones connected need to be the host?
It can be, but doesn't have to be. You could have a user app and an admin app (or combine the two), or manage Firebase database itself via the web based console.
But how can I connect 2 or more phones together? Do I need an activation code?
You need to read all the documentation and guides linked to above to understand most things related to using Firebase with AppInventor.
You won't actually connect two phones together, but they can share, manage and use data provided by the central online firebase database.
Thanks! I’ll go through the documentation and guides again and try to do it. I really appreciate your help
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