there's gdisk and you can set boot flag with it (x->a iirc), but that's a no-op for UEFI boot.
mostly you don't need you partprobe yourself, or it won't work when you need it.
doubt if ext2 is still considered a good choice even for /boot.
pacstrap is not limited for base and base-devel, so you can add "dosfstools" and "efibootmgr" and others.
the grub package is simply "grub" in arch, although the "provides" in its PKGBUILD make your command work.
you don't (need to) start/enable dhcpcd@interface_name.service if you have done it to dhcpcd.service; probably you shouldn't do both, not to mention running dhcpcd manually again.
setting the device "up" with ip manually is often unnecessary because the network agent should normally do the job.
hwclock --systohc --utc set your cmos clock to system utc time, it's not relevant with timezone set.
you probably shouldn't specified -g so a user group with the same name of the username will be created and used; storage and power as supplementary groups is no longer necessary/recommended with systemd.
% is for a group in /etc/sudoer.
you should probably umount /mnt/boot /mnt/home before /mnt, or just umount -R /mnt.
it's ttf-dejavu.
/etc/skel/.xinitrc does not exist anymore, /etc/X11/xinit/xinitrc can be a REFERENCE for .xinitrc.
not sure about the point of setting the network devices down and up.
nm-applet could have been autostarted already with its .desktop file.
xfce4-terminal is in xfce4 group. pacman -S --needed could be nice to use.
there's gdisk and you can set boot flag with it (x->a iirc), but that's a no-op for UEFI boot.
mostly you don't need you partprobe yourself, or it won't work when you need it.
doubt if ext2 is still considered a good choice even for /boot.
pacstrap is not limited for base and base-devel, so you can add "dosfstools" and "efibootmgr" and others.
the grub package is simply "grub" in arch, although the "provides" in its PKGBUILD make your command work.
you don't (need to) start/enable dhcpcd@interface_name.service if you have done it to dhcpcd.service; probably you shouldn't do both, not to mention running
dhcpcdmanually again.setting the device "up" with ip manually is often unnecessary because the network agent should normally do the job.
hwclock --systohc --utcset your cmos clock to system utc time, it's not relevant with timezone set.you probably shouldn't specified -g so a user group with the same name of the username will be created and used; storage and power as supplementary groups is no longer necessary/recommended with systemd.
% is for a group in /etc/sudoer.
you should probably umount /mnt/boot /mnt/home before /mnt, or just umount -R /mnt.
it's ttf-dejavu.
/etc/skel/.xinitrc does not exist anymore, /etc/X11/xinit/xinitrc can be a REFERENCE for .xinitrc.
not sure about the point of setting the network devices down and up.
nm-applet could have been autostarted already with its .desktop file.
xfce4-terminal is in xfce4 group. pacman -S --needed could be nice to use.
Try your best to avoid -Sy.