Did you ever wonder what kind of magic lies inside the guix/ directory? Do you want to help untangle the obscure Guix bugs that appear on the mailing lists, but don't know where to start? Or do you just want to know your package manager of choice better? This talk will hopefully achieve all of the above, by diving deep and introducing the structure and contents of (most) of the Guix tree, so that you can find your way back the next time someone claims an obscure Guix feature is broken!