So I want to get started with linux. I started reading a few books on it and they havetaught me a good amount. Now in an example on one of the books it shows this command:apt-cache search screenshot | grep KDESo now im wondering, as I plan to install Mint Cinnamon, would I replace the KDE with GNOME and would I be able to install a KDE application on GNOME. Thanks(Cinnamon is basically a custom GNOME 3.x right?) 
Can KDE software be installed on GNOME?
linux mint;gnome;kde
Sure, you can install every package you need install on gnome:apt-get install k3bk3b is a CD/DVD burner and Audio ripper.Of course, on first installation of KDE application such as k3b, apt-get first installs some basic dependencies, for following installations such as kmail or kate, apt-get doen't need to re-install the same dependencies.