Fig 1: Loading GIMP 2.6
GIMP user interface has few major sections; drawing area, toolbox, layers window, channels window, history window, navigation area, paint brushes and settings section. Drawing area is used to design your creation, toolbox is having all required tools, navigation section can be used to navigate on entire creation if the image is larger than the drawing window. Other sections are mainly used as supporting windows for rich functionalities of the tool.
Fig 2: GIMP User Interface
Try all the tools in the toolbox and get familiar with the tools and their functionalities to become GIMP guru. It is very important to be very familiar with tools and filters of the tool. You can change the default settings of any tool or filter to perform millions of functionalities using this tool.
Fig 3: GIMP Toolbox