If you saw an image with my poetry, it wasn't mine. before I began taking
My own images, but had begun writing original works I was scalping
Images from google.
Then when I began posting my works outside FB (in Tsū, a pay-for-posting predecessor to Steemit) I was told that this was a big no no, so I found two sites that offered excellent quality, copyright free images.
Those are what I use now for 95% of my writing, always linking out to the source.
Pixabay .com and Unsplash .com are my two "go to" sites.
Thanks for your interest @porters. So to answer your question about training; mostly just trial and error, but I HAVE watched a couple of YouTube tutorials.
Didn't help a lot imo