Open World (Concept)

Hello everyone

I was trying to find relevant information about ‘map size’ and memory allocation (RAM, Virtual, GPU, etc.). I know that this involves several things and they are all ‘related to’ what you have on a map (be it polygons, light, particles, physics, etc., etc.) and hardware of current generations. Something, if possible, more for ‘beginners’

If you can help, I appreciate