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You can't have a "How to Learn Haskell" post without mentioning the Typeclassopedia: http://www.haskell.org/haskellwiki/Typeclassopedia

For those going through LYAH, I highly recommend supplementing chapters 11-13 with this excellent resource.

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I cannot overemphasise how much easier it is to understand Monads once you've groked Functors and Applicatives. It allows you to build an intuition for the _general_ structure and purpose of the typeclasses instead of trying to start with Monads by viewing them through the lens of IO or State.

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