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As a secondary question, is the tutorial cited above still effective given that it is based on the '98 version of the language? I glanced at the diff log on haskell.org between the versions, and it wasn't particularly meaningful to me to understand whether or not I'd be getting negative learning from this resource.
The term you are looking for "data types" or "algebraic data types" in Haskell. They are kind of a combination between structs and enums in other languages, and are the main feature used to describe data in Haskell. I'm currently writing a Haskell tutorial that has a section about data types which might help you. I also created a guide for haskell with links to other recommended learning resources. Hope this helps.