Desktop Environment
How to install Kde, Gnome and Xfce.  KDE Plasma You can install the meta or the plasma group Install sddm it is kde's display manager
$ sudo pacman -S plasma kde-applications sddm
for meta
sudo pacman -S plasma-meta kde-applications-meta sddm
to start up plasma
sudo systemctl start sddm.service
to always use sddm on bootup
sudo systemctl enable sddm.service
Start kde from xorg
startx
exec startplasma-x11
 Gnome
$ sudo pacman -S gnome gnome-extra
to start up Gnome
sudo systemctl start gdm.service
to allways use gdm on bootup
sudo systemctl enable gdm.service
Start Gnome from xorg
startx
exec gnome-session
Xfce
$ sudo pacman -S xfce4 xfce4-goodies
to start up Xfce form a display manager Start Xfce from xorg
startx
exec startxfce4
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