/3/ - 3DCG

Hello, im 22 years old and im trying to become a concept artist. Alot of it mentions "experience in 3D programs" but im not sure what that entails exactly. Does it mean i need to be able to make 3D models for the company or need to know materials or something? Because if by experience just means using the program before, i guess i could say yes, but it dont think it answers the thing its asking. is there something i need to know before hand?i am trying to know everything about i can about this job so nothing goes wrong so any answers are appreciated
also, are things like picrel traced over 3D models? because at this point im not sure, i practice drawing by making up naked bodies in alot of different angles and poses as practice
also happy new year