When you are out and about you may not always have your computer or laptop available with all of your required applications. GIMP Portable lets you you use the GIMP software on any PC without having to install it first.
Perhaps you are at work and you need to do a quick edit on an image. It is likely that you will not be allowed to install unauthorised software on work computers.
Keyboard shortcuts can be a great time saver when working within GIMP. Rather than navigating through the menu structure to find what you are looking for, if you learn some of the common shortcuts it will increase your productivity greatly.
Using GIMP for Windows you may have noticed that the toolbox is always on top. You maximise your image window and the toolbox stays on top obscuring part of your image. Some may argue that this give you access to the toolbar whenever you need it. Personally I find it annoying.
When working on large images I am often zoomed in to 400% and only viewing a small portion of the image. This makes it difficult to see any changes in context to the entire image. You could of course zoom in and out to see the overall effect of your changes to the image (the novelty of doing this will soon wear off).
The easy answer is to use the View > New View menu and create yourself a new view of the current image. You can set different parameters for your new view such as the Zoom.
This tutorial will take you through the process of removing image backgrounds step-by-step using the freely available gimp software. This tutorial assumes you are running the Windows version, but the concept applies equally to other versions of the gimp and other photo editing software such as Photoshop.
The assumption is that you have a basic understanding of how to use the gimp.