Question Build for Professional (Game Development) use + Gaming

[ilPolka]

Hello everyone,

I'm pretty much new to building computers, even though I develop software for a living I don't know much about hardware.
I put together one of the worst possible builds through PCPartPicker, I'm here seeking for advice from more experienced builders.

If you can detail the reason behind each part's improvement, I'd be very grateful, as I'm trying to learn.
Thanks in advance to whoever will contribute!