You asked
Is the nikon af s 50mm f 1 8g good in low light?
Yes, it's a good low-light lens. Its f/1.8 aperture gathers far more light than any kit zoom, at a low price. That's the main advantage of a fast prime, as Primes or zooms explains.
It isn't stabilised, so in dim rooms keep your shutter speed up or brace yourself. It works best on full frame, where it's exactly 50mm. Pair it with the Nikon D750 or Nikon D850. On APS-C, like the Nikon D7500, it frames as about 75mm, which suits portraits well. If low light and events are your main work, full frame is worth it.
Written by Claude from this site's pages.