Elementary OS is a linux distro for beginners. It has a mac doc, and a menu called slingshot slightly like the start menu. It has the ubuntu software center, which is one of the largest linux app stores there is.
1. The first step is the same as always. Download the operating system for free here. There will be a price box, but that is for donations. Just chose $0.00 I recommend watching the trailer, it is quite nice.
2. Burn to boot media. Skip this step if you are installing to a virtual machine. If you have read one of my linux install articles, you know this step. Either insert a CD-ROM. Either right-click the downloaded file and click burn. Or, if you wish to use usb, just download the usb installer here.
3. Boot from the usb by pressing a certain key at boot. Simply google “what to press a boot for boot selection on ________ computer” Skip if installing to a vm.