This is a very subjective area, but in general:
Beginner: One who has very little understanding of the workings of their camera. They have not done much more “point and shoot” photography. Enjoys taking snapshots but wants to learn more about composition, lighting, and the capabilities of their camera to enhance their images.
Intermediate: One who has basic understanding of their camera. They have read their manual or other photography-related information and can use more than one lens. They know basics such as aperture, shutter speed, composition and how to use some of the manual settings on their camera. They are looking to expand their knowledge by going deeper into the capabilities of their camera as well as learning art of photography.
Advanced: One who has a great understanding of their camera and the art of photography. They have multiple lenses and can use the manual settings on their camera with ease. They understand lighting, flash-photography, different compositions, depth, backgrounds, movement, contrast, framing etc. They are looking to be guided to the scenic areas at optimal times for the best shots. They are open to additional photographic tips and enjoy talking “shop” with their instructors.