How do I get started with Google Firebase?

Hi everyone, I need to build a project using MIT APP Inventor and use Google Firebase as my cloud database. How Can I get started with Google Firebase working on my App inventor? I've seached for a several tutorials on youtube but cant find anyone who really help me. If anyone could help me with that I apriciate it.

For you know the project consist on: I have a esp8266 that every time a button is pressed the esp8266 sends a data to my Firebase. The app is needed to every time a new data is written on firebase send a notification to the user on his phone. I need to know how to do that connection (firebase + app) and send the notification

Do you mean in the app, or elsewhere a button is pressed?

You can setup your app to receive notifications from Firebase in the background

You would use the native firebase component in AI2 to do this, or you can use the web component.

You can search this community for information on how to work with an ESP8266.

Sorry for that, the button is pressed on the ESP8266, then the esp send data to my firebase

You can start by setting up your Firebase project and linking it to MIT App Inventor. Use the Firebase Database component to send and receive data. For notifications, consider using the itoo extension, which can handle push notifications when data changes in Firebase.