GLOSSARY: Key concepts
You could set up a glossary of key concepts (terms, definitions) that is carried forward to future topics (legacy). This approach motivates students to become collaborators in creating a resource that will help future students. You could set up the glossary so that students can create entries themselves, or comment on entries created by you. This glossary could become the 'text' for the topic and use multiple means of representation (eg videos, open educational resources).
Talk to your faculty eLearning support team about how to do this as it is set up in the permissions. You could also create a 'Random glossary entry' block.