Honestly most of what I've learned about how to use SD comes from seeing what other people have done and trying to tweak or adjust to get a feel for the tool and its various models. Spend some time on a site like CivitAI to both see what can be done and to find models. I'm very much a noob and cannot produce results nearly as impressive as a good chunk of what I find on there.
The most important thing I've learned is how much generative AI, especially SD, is just a tool. And people with more creativity and a better understanding of the tool use it better, just like every other tool.
I do like the idea of using it in GIMP as an answer to Adobe's Firefly.
Isn’t DDG also tied to Bing? I could be mistaken.