As an educator, this is the thing I always say. If you try to teach someone programming for example, try to make a honest list of all required prior knowledge.

As an educator, this is the thing I always say. If you try to teach someone programming for example, try to make a honest list of all required prior knowledge. This is usually stuff that is totally obvious to anybody in the field, but if you don't know it it might give you a hard time. E.g. that programs run within the context of an operating system and the OS provides interfaces for interaction with hardware. Not all of that is needed upfront, but certain explanations just won't make any sense if required knowledge is missing.