Accessibility and usability are two aspects of e-learning content quality that ensure that your content is accessible and usable by all learners, regardless of their abilities, devices, or environments. Accessibility refers to the design of your content to accommodate learners with disabilities, such as visual, auditory, cognitive, or motor impairments. Usability refers to the ease of use and navigation of your content, such as the layout, structure, interface, and functionality. To follow accessibility and usability standards, you should use clear and simple language that is easy to understand and read. Furthermore, contrast, color, font size, and spacing should be used to enhance readability and visibility. Additionally, alternative text, captions, transcripts, and audio descriptions should be provided for multimedia elements. Furthermore, consistent and intuitive navigation and menus should be used to allow learners to move through your content smoothly and easily. Finally, testing your content on different devices, browsers, and screen sizes will ensure compatibility and responsiveness.