\begin{itemize}
\item the most popular haskell course from Brent Yorgey:\\ \url{https://www.seas.upenn.edu/~cis194/fall14/spring13/lectures.html}
\item very verbose and enthusiastic haskell book, good for reading once:\\ \url{http://learnyouahaskell.com}
\item collection of websites teaching haskell:\\ \url{https://github.com/bitemyapp/learnhaskell}
\item haskell programming tips (and wiki):\\ \url{https://wiki.haskell.org/Haskell_programming_tips}
\item the standard module (similar to libc in C):\\ \url{https://hackage.haskell.org/package/base-4.7.0.0/docs/Prelude.html}
\item debugging in haskell:\\ \url{https://wiki.haskell.org/Debugging}
\end{itemize}