Light Glitch / Green Artifacts

Hello, I’ve been trying to force myself to use something out of my safety bubble for once, and as expected problems instantly appeared and I don’t even know what they’re caused by.

Any idea please?

It’s on a first person shooter new project, I’m following this tutorial: Youtube Video

This looks very much like a local hardware problem.
I would suspect the graphics card, rather than the CPU/motherboard.
It could be drivers, too, so that’s the first thing to try.

How can I recognize a problem with the Graphic Card or a Driver?