The Guix documentation videos explain common usage. They can be found on the Guix website since only a few days ago. For example, reclaiming space is explained at minute 1:01 here:
https://guix.gnu.org/videos/everyday-use-of-gnu-guix,-part-two/index.html I hope these videos are prominent enough now, because I think they are very good. Regards, Florian
