Learning most vital language extensions

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Based on recent Haskell survey results http://taylor.fausak.me/2017/11/15/2017-state-of-haskell-survey-results/#question-21

Exercise that uses extension: OverloadedStrings

Exercise that uses extension: BangPatterns

Exercise that uses extension: GADTs

Exercise that uses extension: DeriveFunctor

Exercise that uses extension: DeriveGeneric

Exercise that uses extension: LambdaCase

Exercise that uses extension: ScopedTypeVariables

Exercise that uses extension: DeriveFoldable

Exercise that uses extension: RankNTypes

Exercise that uses extension: GeneralizedNewtypeDerivin