You can look at things like

www.newegg.com/tools/custom-pc-builder

To see some ideas of what would work, and I hope you feel free to ask around as you look at things! We all had to learn somehow and once you know what you’re looking for it’s just a small puzzle.

Quick suggestion is to decide on the cpu (I’m partial to amd so I’d pick something ryzen based if you want processing power) first then compatible motherboard, as after those two you should be able to just look at spec sheets and see things like the kind of ram you need case type etc.