Problems with Arch linux installation commands

Question

It's my first time trying to install and using Arch linux, I was trying to install it in VirtualBox in Mac Os mojave, when i did arch-chroot /mnt(after all the configuration), then tried to nano /etc/locale.conf it just printed command not found.

I've already tried with vim or other commands like sudo or apt to install a plain text editor but it's always the same and I also tried twice but nothing changes.

PLEEAAASE, I need help.