In this video, you will learn how to create PowerApps repeating tables like you had in InfoPath. We will use SharePoint lists as the data sources and create an expense report. We will do this by customizing a gallery to make it the repeating table including full tab support for easy data entry.
Part 2 is here:
https://www.youtube.com/watch?v=DylxsXIUyDc
Link to video on Collections
https://www.youtube.com/watch?v=DF4KX1oSrVI
For more information check out PowerApps911 https://www.PowerApps911.com