You can find a lot of information on ArcoLinux but there is so much more out there.
The first website to learn about qtile is qtile itself.
or
the latest documentation
http://docs.qtile.org/en/latest/
As always I direct you to the Arch Wiki
https://wiki.archlinux.org/index.php/Qtile
As an example we will add RatioTile as a different layout.
http://docs.qtile.org/en/latest/manual/ref/layouts.html#ratiotile
I was able to crash my qtile with my experiments!!
The exercise in the video is save and will become part of the general Qtile config.
But not all layouts worked and eventually broke qtile.
The way to solve the broken config was to go in TTY
and open up the config.py with nano and delete the lines I added.