Run ‘bash’ and then follow the guide, assuming it’s too complex to tweak for fish.

As an Arch user I hate these memes. Guys, the only difference between distros is effectively the versions of packages you’re getting, and what the default packages and configs are. In Ubuntu you are completely free to have a very minimal i3 setup (I did for several years!) while in Arch you can use some bloated Gnome UI. This “Arch is fast and Ubuntu is slow” really isn’t true if you compare Arch-Gnome vs Ubuntu-Gnome, or Arch-i3 vs Ubuntu-i3.