Other than that, unless someone here downloaded all of arcsynthesis before it was taken down, there's nothing really else you can do. Which is a shame, because that was a fantastic beginners site.
Here, I'm currently learning OpenGL from this resource/tutorial aaaand I knew something like this can happen (but in a far future D: ). I downloaded the tutorial two months ago, so here, you can download it.
I will delete the link when website its up again