The Book of GIMP. A Complete Guide to Nearly Everything by Olivier Lecarme and Karine Delvare
I have decided to go out a bit from my comfort zone and learn some basics of graphic/drawing/design maybe and I bought this book for this reason. I can say for sure that I was really hard for me, I was surely pushed out of my comfort zone and struggled with this book for really long...
I have learn't a lot, not sure if it will be of any use but I still am happy to read it.
If you're like me consider not starting with tutorials, especially when it get's complicated and first read more about tool you're supposed to use. If you are interested in editing of images then there is much in a book about it. I was more interested in pixel art and drawing and there wasn't much about it considering content about images.
Rating is really hard this time so remember this is highly subjective: 6/10.