How do you make a ListView with Firebase?

I want to present tags in one list view and values in a second list view. I looked at tutorials like these, Bot Verification, https://community.appinventor.mit.edu/t/need-help-using- listview-with-firebase/42614 but I still can't understand it

Does each value relate to the tag?

Why two listviews, you could show both in one?

Show your data coming back from firebase