[Haskell-beginners] How to best handle classes of types, interactions and listing of different types?

[Imants Cekusins]

for me a rule of thumb for choosing features / extensions is: if I see
compiler errors, I should understand them and know how to fix them.
​
Parameterized types, type sinonyms, records and classes with as few
extensions as possible are pretty much all I use, type wise. You can do a
lot with them alone.
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