Cropping is a fairly simple process. You simply select a section of your image, and isolate it. But trying to figure out when and where and how much to crop your image can be a not so easy task, and is often left to the tastes of each individual creator. In this website, I'll go over a few different ways to crop images and give my own reasons why I decided to crop them the way I did.
Don't be afraid to explore cropping in your own ways.
On every page there is an example with before and after pictures of cropping. My own example of cropping is in the right hand corner of this page.