envatomarket, codecanyon, themeforest, blueowlcreative : what are their roles

I bought a license for the theme Fortuna . I am lost between all the interested parties: envatomarket, codecanyon, themeforest, blueowlcreative.
What are their respective roles? who supports the product to ask a question?

The author would be who to talk to about support https://themeforest.net/item/fortuna-responsive-multipurpose-wordpress-theme/12496833/support

Envato is the company that runs the marketplaces, Themeforest is one of the marketplaces and BlueOwl is the creator and seller of the theme on that marketplace. So as Charlie says, BlueOwl is the one you want to speak to if you have any issues with the theme. Envato if you have any issues with the site, payment etc.

Thank you, it’s very clear. But what does codecanyon do?

That is the name of which envato marketplace (they run several based on the different types of files that they sell) the item is sold through

Merci pour votre réponse précise et complète.