There are some design decisions you can make that will help all learners use your online course effectively:
Provide readings well in advance of deadlines so users can work ahead and prepare. Many learners need the extra time to read through content multiple times. If you use release conditions to control when to release course content on a module by module basis, make sure you give learners plenty of time to complete each component.
One of the most effective course design decisions you can make to improve engagement is to offer course materials that appeal to more than one sense. For example, the same material can have an audio, video, and text component. This type of redundancy helps engage learners with different learning types, reinforces important concepts, and helps ensure that users with physical disabilities can access content in a suitable format.
Most of the following tips provided are web content standards set by the World Wide Web Consortium in the Web Content Accessibility Guidelines and should be considered when creating HTML content: