AlphaxAlwx

So I'm a new PC builder. I bought my own parts and made the pc as i felt confident that i could make it without many issues. In November I bought everything apart form a GPU as the prices were too high to justify. However, on the weekend I bought a brand new RTX3060 ti from gigabyte. I am unsure what I have done wrong but at first when I try to run games the screen would go black for everytime I moved, the game was PUBG. Then I tried restarting my pc to no avail. Lastly I tried turning down the resolution of the game to 1080p form 1440p but the game is now in the top left side of my monitor. Any help is urgent as I do not have the slightest clue what is going on, let alone how to fix it. I can provide whatever information is necessary to help, also I live in the UK so I'm about to go to sleep so any advice I'll use in the morning. One last thing, be as explanative as possible as I'm new to PC's and only have a basic idea at what I'm doing, hence the situation I'm in. Cheers everyone.

Right so every week me and a few of my friends do a quiz like probably most of us nowerdays. However I want to see if I can change things up a little, now there is a game called ‘GeoGuesser’ and the premise of the game is that you are dropped into a street that is in google street view and you have to guess where in the world you are. Now the problem is I don’t know if there is any way I can live share what is on my screen to my friends, if anyone knows of any apps I can use or any advice would be greatly appreciated.