[jpnelson]

I'd love it if there was some sort of "helper terminal" that could teach people things like git, and basic command line stuff as they went.

It could catch common errors and provide useful explanations. It could possibly even go as far as attempting to understand plain text commands, eg "delete the file file.txt" and suggest commands to do that.

[eitland]

Clippy, as orginally designed before they gimped it? ;-)

Or just contextual help as it existed in many Windows applications (and certain current iOS apps).