You asked
Is the nikon af s dx 18 300mm f 3 5 6 3g ed vr good for wildlife?
Yes, with caveats. On an APS-C body, the Nikon AF-S DX 18-300mm f/3.5-6.3G ED VR reaches roughly 450mm equivalent, which is real reach for wildlife. It's stabilised, which helps when you're handholding at the long end.
The catch is the aperture. It drops to f/6.3 at 300mm, so you'll need good light or a higher ISO, and your subject needs to hold still. It's a good fit for garden birds, backyard mammals and zoo visits. For fast sport or dim woodland, you'll want a faster lens. The wildlife and sport page covers what to prioritise. The reach comes from the crop factor, so this lens makes most sense on a DX body such as the Nikon D7500.
Written by Claude from this site's pages.