Is it safe to buy a used camera?

Here is what the site says about that.

From Your first camera: Don't overthink it: Every current camera from a major brand is good. The differences that matter for a beginner are size, handling, and which lenses the mount offers. Hold a few in a shop if you can, pick the one that feels right in your hand, and buy it used if you want to save money: see buying used.

From Nikon D750: Nikon D750: A DSLR by Nikon with a 24.3-megapixel full frame sensor, announced in 2014. Old, but a classic used full-frame buy.

Quoted from this site's pages.