I’m used to doing this with Photoshop, but doing it on GIMP was quite … Details
Think of tags as like a book index where you find words and which pages they are on, the same principle applies here. Although it's taken a stage further so it might not be the word, but the subject, so for example if you're looking for things to do with fractal gradients for example. A tag may bring back posts with gradient files, as well as posts that discuss gradients, or tutorials about them.
I created a series of three new galleries. these galleries contain fractals which are tied to the free software “the gimp” (an image manipulation program close to photoshop).