Learning resources - data structure

Does anyone know of any good resources to better understand the data structure in bubble? I have completed the basic tutorials and reviewed the documentation.

I’m a beginner to bubble and am looking to build a basic form completion application with maybe 3 or 4 different forms, each with their own field list (ideally this would be dynamic to an admin page but one step at a time) as well as a front page with stats like 3 forms completed this month.

In SQL I think this would be straight forward I’m assuming a type is a table and field is the same but the “this field is a list” and then getting types to interact in the front end is throwing me.