Tools:
Haskell template – haskell nix template
Build Tools – introduction to stack and cabal
Stylish Haskell – code prettifier
Language:
Learn Haskell Now – haskell tutorial
Untangling Haskell’s Strings – about strings in haskell
Mutable – library for atomic mutable references
Real world projects
A game in Idris – a game written in Idris (extended Haskell)