https://xmonad.org/tour.html
https://xmonad.org/TUTORIAL.html

https://wiki.haskell.org/Xmonad/xmonad_development_tutorial
https://wiki.haskell.org/Xmonad/Guided_tour_of_the_xmonad_source

https://beginners-guide-to-xmonad.readthedocs.io/index.html
https://beginners-guide-to-xmonad.readthedocs.io/configure_xmonadhs.html