I am in the process of setting up a shop and I wondered why there only categories but no sub-categories? It will be very hard to organize a large shop just with one category and tags.

Also I have tried to set up variants for a demo product and a new product but both didn't show up on the website. I have tried color and size as described here: https://support.appdrag.com/blog/50-How-to-use-variants-.html?category=10

Is there anything else that needs to be activated before variations are shown?

Last but not least what is the required format for image URLs when importing via CSV file from an external source?

Thanks!