Photoshop expert Jesús Ramirez (from the Photoshop training channel) published an interesting video tutorial looking at how you can integrate 3D models into your photography using Photoshop.
Some photographers might consider this sort of manipulation blasphemous, however especially in the advertising industry, integrating both real photography and artificial objects is quite common and learning how to create this type of composite images can be important if you are or planing to be part of this industry.
Ramirez explains the process of getting a 3D object – you can find quite a few free 3D objects but if you need something very specific or very detailed yo might need to pay (in some cases quite a lot actually). Next, Ramirez shows how to place a 3D model in the right perspective and how to apply materials to the various pieces of geometry. Then you’ll learn to use IBLs (Image Based Lights) to help illuminate the scene and create reflections.
This is a comprehensive tutorial with a lot of information for advanced users, it might be worth watching more than once and even trying to do this at the same time to actually experience the technique.