For designers switching to AI tools, the question of what to learn first for the best ROI—my answer is start with ControlNet and img2img for control, don’t rush into flashy stuff. Reason’s simple: designers already have composition and aesthetic chops, what you’re missing is the ability to nail down the image in your head precisely.
Relying purely on prompt gacha-style re-rolling is a waste for you; what you need is to use line art, poses, reference images to constrain the model and make it obey.
Once you’ve got that down, your existing design skills can kick in immediately. As for training LoRAs or building complex workflows, learn that later when you need to mass-produce the same style.