Android and Firebase App Examples?

I am trying to learn how to use the Android with Database. And I have found out that the Firebase is one solution for this. And though it seems like a good solution, You have to do things from scratch. I am trying to find out if it's possible to make use of the firebase for complete online app. I wonder how good that can be for many free apps. I meant to say if the apps such as that are free, how that would recover the money. That's why I want to find out quick tutorial on making such apps without wasting much time.

Where do you find some good tutorials for Android and Firebase?
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