My son wanted a gaming PC... so we did the research against his goals... or fastest he could get for under $600.
We watched YouTube videos on how to build your own PC.
Read sites about essential pieces for gaming.
And then crawled gaming PC makers like Alienware, Skytech, etc.
Ultimately we bought a refurbished (customer refused, not used) Skytech with Ryzen 5 (latest chip), Nvidia 1080 card, SSD, 64GB, 1TB HD, etc... retails $975+... $500 on ebay.
The thing smokes my XBOX S. The gaming and frame rates are staggering smooth.
Here's a youtube vid we used to map out our wants list as well as getting familiar with the PC box.