Writing instructions and recaps for eLearning

I'm not sure if I understand your question. Are you asking if using "we" to refer to the course narrator and the learner is OK, or are you asking if it's proper to refer to earlier parts of the course as "sections"?

Research shows that using conversational language DOES improve students' ability to learn compared to more formal language. For example, using active voice and second-person point of view is a best practice that aligns with this research. While "we talked about" is technically NOT second-person (it's first-person plural), it's still conversational and is probably fine. I generally try to stick to 2nd-person, so I'd probably write this as "In the previous section you learned blah blah blah." I usually use "we" to refer to the organization as a whole (e.g., "In the last section, you learned that since we began using Process XYZ, we've lowered our labor costs by 25%.")

I also think it's fine to refer to parts of a course as "sections" though it would also be worth standardizing on your terminology. Are they "sections", "modules," "chapters," or "lessons," etc.? Pick one and then use it consistently to minimize confusion.