You need to have the course first, but that is probably created by your institution. I like to think of modules as units; in my classes, I have a module for each week, so I start with those and then add the information I want in each module. You can add files, assignments, quizzes, pages, or text headers - check out How Do I Add Course Content as Module Items?
A page is basically like posting a Word doc that students view inside of Canvas - think of it as one-way info from you to the students. (This is a simplification, but I find it helps in terms of understanding the concept.) You could have a whole course without using pages at all.
If you're just starting in Canvas, my advice is to keep it simple. 🙂 Create a module for each week, then within each week, post your handouts, readings, or assignments.
Good luck!
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