You finished installing CentOS7 and its minimal and drops you at the console prompt but no desktop.
Install GNOME desktop
yum -y groups install “GNOME Desktop”
When complete use the following command to run it
Once you log in you will have to answer a few questions to configure the desktop
One of the challenges is that startx would have to be run after every reboot, /etc/inittab is deprecated but systemd uses ‘targets’ instead of runlevels. Run the following command to enable the GUI on system start.
ln -sf /lib/systemd/system/runlevel5.target /etc/systemd/system/default.target
Reboot and note that the desktop starts automatically