Could do with examples relating to the "self-replicating" nature.

Also should indicate it's case-insensitive, and the tutorial should be more permissive about how you type the examples e.g. typing lower case should be okay.

Missing a lot of basic words like HERE and , but I'm guessing this is to do with limitations of the underlying memory model, but there's not a lot of info on how to achieve arrays/lists without it.