I am not quite sure that \ is neccecary to solve this problem. The language learners might try to avoid this.
This request is a review question. I have seen too many online tutorials without exercises, they might forget what they learned before when they learn something new. (That is exactly what happened to me.)
Also I feel that your first two exercises are too easy and not challenging for the learners...
It might be a good idea to mention the behavior of , as a side note in the answer of exercise 2, in order to allow the exercises to stand alone without making the learners go to other web pages.
room topic changed to Sixth Barrel : For general discussion about Keg (esolangs.org/wiki/Keg) or questions about learning or golfing in Keg [class] [code-golf] [keg] [practice] [tips]