The section on strings mentions an operator and type that isn't explained for another couple of sections: "Strings are lists" !! 0 -- 'S' That could probab

The section on strings mentions an operator and type that isn't explained for another couple of sections: "Strings are lists" !! 0 -- 'S' That could probably be omitted or the logical progression modified so that you learn about `!!` and lists first. Of course, ignore my suggestion if the whole "learn x in y minutes" format assumes prior knowledge of programming language concepts.