Modules are containers that hold content in order. Pages are flexible content pages that combine text, images, and embedded media. Build a module per unit, or per content type if that fits your modality, then add Pages, assignments, and links inside it.

Prefer a Page that introduces and frames a reading over uploading a lone PDF. There are real reasons to frame rather than dump: a Page is accessible, works on a phone, and lets you tell students why a reading is here and what to do with it. A decontextualized file does none of that, so students are left guessing at its purpose. Reserve the Files area for downloads students genuinely need to keep.