I teach imaging workshops for Photoshop, GIMP and Lightroom. These workshops focus on skills needed by a photographer rather than a graphic artist or designer.
I personally use and love Lightroom to sort and manage my images and to perform non-destructive edits on my original images.
I also use and recommend GIMP as a free alternative to a Photoshop CC subscription. My wokshops in Photoshop and GIMP focus on harnessing the power of layer and layer masks to edit images. I also teach techniques in scanning and restoring film and photographs.
These imaging workshops are offered through Adult Ed with the exception of Lightroom which is offerred only through my email list.
Click here for official GIMP download page