Help regarding Firebase DB in Video App

Hii Makers,

So here i just have a query that if i have a data base like this in :firebase: for each video :point_down:


then how can i show it like this in my App:question: :point_down:

:question: Also if i wanna not to display all the tags at a time as it will take a lot time to load all tags if they are in hundreds so i wanna to first some videos( tags values) and when the user completely scroll the page then start loading next 20- 30 values :question: