/vt/ - Virtual Youtubers

Hi /vtai/, lurker here for the last couple of months.
I would like to get better at this and start contributing occasionally, so I was hoping you could spoonfeed me for a bit here.
I tried doing my archive and rentry reps but there is just so much shit to go through, I will burn out before even starting to prompt.

1. Is there a difference between hi-res fix and upscalers? I've noticed hires contributes greatly to image quality and detail whilst upscalers do not. Am I simply using upscalers wrong?
2. Is there a way to check or know which resolution a model was trained on? Or should I just assume 512x512?
3. Could you recommend a good starting-point coomer model to practice prompting.

Have a test-run ojou.