Whenever there is talk of image editing in connection with free - open source - software, the name "GIMP" is mentioned as a central term. This EBook refers to GIMP version 2.10.*. In this edition, the new features up to 2023 (version 2.10.34) have been taken into account. Many of the functions described here were not available in earlier versions. In particular, many functions have been added that make working with * high color depths * linear color spaces * large displays * new tools * and many layers and many layers. The book summarizes the most important 101 tips for using the software.