The way I usually start teaching using the console to my (very much non-tech) students is set up a safe container and then let them type whatever, invariably generating a lot of error messages. Then I challenge them to generate different error messages, “gotta catch em all” style. Then we talk about the error messages and what they might mean. After this exercise they usually get the basic idea of command – response, what to look out for and how to compose valid commands.