Not knowledgeable on computers, which one is best? What's the most important things I need to look for?

I'm not the most knowledgeable on pc specs but my sister deserves something good after the God awful year she's had. I can't afford something other then a cheap prebuilt but I at least want to get her the best I can. If i can get some advice on what to look for in particular ot any other cheap prebuilt recs id love that too! Budgets around $650 tops. Will send more pics of the listings if needed