Display content from multiple database collections

I have never really understood the concept of " reference field" in wix data. How it is used to display content from multiple collections…

I have searched online and haven’t come across any dedicated tutorial to explain this intriguing concept. This is the only topic I am not able to grasp by reading the support articles on “wix data”.

How to connect two database using reference field? Where this could be applied practically?

Would anyone care to share their knowledge on this??

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Have you read this post from wix?

This explains mostly everything about reference fields…