As you must already know, GIMP (GNU Image Manipulation Program) is a free open source software, a versatile tool for image retouching and editing. It’s freely available for Microsoft Windows, Apple Mac OS X and Linux. Considering it’s an entire package, you must know that GIMP has tools used for image retouching and editing, free-form drawing, resizing, cropping, photo-montages (combining multiple images), converting between different image formats, and more specialised tasks. Animated images such as GIF and MPEG files can be created using an animation plugin.
The great number of users created a community and now you can find a lot of GIMP tutorials over the internet. So, if you are a starter in using this software and you want to learn more about it you can. I only selected a few tutorials on three distinct sections, depending of your expertiese on using GIMP.