> Don't just read stuff, run it in GHCI

Newcomers should absolutely use ghci commands like :t :type https://downloads.haskell.org/ghc/latest/docs/html/users_gui... to tinker and experiment. Also :info and :instances https://downloads.haskell.org/ghc/latest/docs/html/users_gui... once they start learning about typeclasses.

Typed holes can also be really helpful https://downloads.haskell.org/ghc/latest/docs/html/users_gui...