You know more about linux than I do,
sudo = permits users to execute command as super user
Apt appears to be for installing packages
this shows how to find out what commands do:
https://unix.stackexchange.com/questions/94338/what-does-the-commands-sudo-apt-get-install-and-fakeroot-stand-for
all you did was download packages from a repository called ppa:nilarimogard/webupd8
Here is another way to make the USB in linux, I have heard of gparted before - https://www.linuxbabe.com/ubuntu/easily-create-windows-10-bootable-usb-ubuntu