It can be a bit of a rabbit hole. I wasn't happy with any of the window managers or desktop environments for Linux so I wrote my own. I didn't like the way any of them handled multiple monitors, but it ends up being more than a multi day project. I still don't have what I want, so now I'm trying to find a way to get rid of X or at least fix XRandR, because it doesn't support multiple GPU's the way I would like (Wayland is not a solution either).