Resources would include any/all extra supporting and scaffolding materials needed for the unit. I typically like to give my students more resources than they’ll need for an assignments. I’d fold in the readings and videos here
Digitally Literate Courses: Structure of courses, modules, & learning pathways
W. Ian O'Byrne

Resources could also have a crowd source part to it, you must add top the possible readings and videos etc as you use the course. Provide ideas and links for others. Discussion around these could also then deepen learning and engagement