Upgrading Graphics Card

Hi guys, Forgive me if I have to ask you lots of dumb questions as I haven't looked inside a computer for like over 10 years but I want to get into VR gaming and possibly game developing. My PC isn't up to the minimum requirements on Oculus's website for a Rift S. I know I could just upgrade my...

This started a couple of weeks ago I estimate & is driving me nuts. I've tried to track it down & can't find anything that's causing it. The pc will work absolutely normally from boot & at some point (I'm not sure as it seems to be random) I will suddenly get huge input lag when typing - in...