Hi Sheldon - thanks for asking this.
I've added links in the lessons now between the two use cases for "y" and "en" with affirmative commands so you can compare them.
You may also find it useful to know that in any of our lessons you can generally see related lessons listed on the lower right even if they're not listed within the leson. Also, the links under the "Jargon Buster" will take you to the glossary where you can see other lessons appearing under the same area of grammar.
"y" and "en" are called Adverbial Pronouns and they're used in various additional situations: https://french.kwiziq.com/revision/glossary/pronoun-type/adverbial-pronouns
Hope that helps!
