GIMP is a freely distributed GNU Image Manipulation Program. Available for such tasks as photo retouching, image composition and image authoring. It’s always fun to experiment different techniques and learn how to work with various aspects of GIMP to spice up boring pictures and make them into works of arts and masterpieces.
So, if you’re interested in learning some new skills, whether you’re a beginner, intermediate or advanced user, these GIMP tutorials are for you. LINK