Online pedagogies can vary substantially. While some courses allow for a certain degree of self-pacing, others have assignments or required activities frequently (even daily). Course meetings may also occur synchronously or asynchronously. Students who regularly miss required assignments or activities may be dropped for non-participation, just as students can be dropped from in-person courses for non-participation.
To learn more about the expectations for a course you are considering, please reach out to the instructor or department offering the course. Once you have enrolled, log in to Gauchospace to view the syllabus and look out for any email announcements the instructor may send out before instruction begins, as these may help you to better understand the expectations for your specific online course.