The blog post introduces one useful data type, infinite list, in Haskell.

The blog post introduces one of the most important typeclasses, Monad, in Haskell.

The blog post introduces an important typeclass, Applicative, in Haskell.

The blog post introduces an important typeclass, Functor, in Haskell.

The blog post introduces an important concept, IO actions, in Haskell.