Ask HN: How do you assemble a computer in 2021?

I have assembled my last "gaming" rig in 2010, and have used laptops ever since. I'm now looking into assembling a new desktop computer, and I don't know where to start. Is there a 2021-updated resource that could provide some guidance?

I though of playing PC Building Simulator https://store.steampowered.com/app/621060/PC_Building_Simulator/ before building the real thing, but I don't know how realistic it is (perhaps very?).