RX 580 build under $700.
I decided to go with AMD RYZEN 3 1200 instead of 1300 because its $20 cheaper which I spent on an aftermarket cooler. performance-wise an Overclocked 1200 is roughly equivalent to the 1300 plus I got the aesthetics of an aftermarket cooler. I could've chosen A GTX 1060 3GB for cheaper but I wanted the looks of an MSI card on budget so Rx 580 4GB was the only option. Also there's no potential of bottle-necking whatsoever with the stock as as well as overclocked 1200 CPU. The MSI B350m gaming pro is the best motherboard I could find for a $700 build while matching RED/BLACK color scheme. And its overclockable.
In terms of benchmarks, I doubt one you can build better system under $700 than this based on my long pre-build research, you can research further for more detail explanation of each individual part by experts. only thing missing is RGB led that i will install soon.
Allocate extra ~$100 for Operating system if you don't have one. I got mine for free from My University. all parts are from Newegg. total maybe $40- $50 less at other merchandises. Leave a like if you think it was a good first build. (I switched from console) Thanks