Linux Mint KDE Review: Easy And Beautiful
The second is Documentation which you should read over once if you are new to computer or Linux world.
Then we have app which is like play store in android. It is a package management software or at least its front-end. We can install apps from it easily.
Then, you have a forum, where you can post your questions and issues to get help. These are the things should first check out on your first install.