I want to build a PC, but don’t know how.

I would like to build a Desktop, for gaming purposes, and have a budget of about $700-$800 USD (I don’t have the money yet, but I’d be saving up for it, hopefully. I have about $100 rn)

I’ve already been given some resources like Newegg and pcpartpicker, but I was wondering if anyone had advice on good pieces, where I could find them, for a cheap enough price?

Edit: I know next to nothing about computers, and I play games like Fortnite, Minecraft, stardew valley, and im open to trying new games like COD, rainbow six siege, etc.