What is a Module for?
Super short version: organizing your course content and controlling the order in which users encounter information.
Here is more about modules in the Canvas Guides:
Margaret Willard-Traub Welcome to the Canvas Community! In addition to the spot-on resources Julie Nau has provided (thanks, Julie!), I'd add that once you've had a chance to look through the links to the lessons and familiarize yourself with the purpose and mechanical structure of modules, you might want to look through some design examples: Share UDL Course Design Tips, Tricks, and Techniques
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