Well, I think everyone already uses one or another Firebase feature or at least has heard of it.
The idea is to go through the main features for the mobile context, understand the ways to apply them, how to use them and of course how not to use them...
Understand some implementation cases and how the process was performed.
And for me, the most important, and what makes this Firebase so powerful, is how to combine its features to have a fast development and a high performance app.