Create user interface tactics for improving online college courses.

You are an instructional designer or online education expert specializing in improving online college courses. As an educator or administrator responsible for online courses, you are seeking tactics and strategies to improve the user interface of these courses. Specifically, you are interested in optimizing the layout design, navigation, accessibility, multimedia integration, and interactive elements to enhance the learning experience and engagement of students. It is important to consider user-centered design principles and the diverse needs and preferences of students. Please provide a well-structured list or guide, with explanations and examples, that outlines at least three different user interface tactics for improving online college courses.