This article explains the GIMP tool box or the place where are the tool are. It will help clarify what each tool does. Thanks to About.com for this article.
By Ian Pullen, About.com Contributing Writer
The Toolbox is the point of easy access to all the main tools within GIMP. The Toolbox must always be open as closing the Toolbox will force the whole application to quit.
The tools break down into three primary groups of tools, namely selection, paint and transform tools, with a few miscellaneous tools falling outside these groups.
By default, below the Toolbox is docked the Tool Options dialog, but if you prefer you can remove the dialog from that position and dock it into another raft of dockable dialogs or have it float free on its own. Personally I leave it docked below the Toolbox as that seems the best use of space.
The Tool Options dialog displays various options for adjusting the way that each tool operates. The information displayed varies depending on which tool is currently selected.
The selection tools offer a range of ways to select areas of images to allow you to work on some pixels without affecting those surrounding them. All of these tools share the same main tool options, including the operating Mode, Antialiasing and Feather edges.
These offer a range of ways to change the appearance of individual pixels or groups of pixels.
Apart from the first two listed here, the transform tools can generally operate on layers, selections and paths.
This last group of tools cover several important but standalone features.
It’s very easy to become blind to tools that you don’t use on a regular basis, but if you want to get the most out of GIMP, any time that you can spare to experiment with the full range of tools will be paid back as you produce more impressive results and, generally, more quickly.