To ensure student engagement and retention in your online course, focus on creating interactive and engaging learning experiences. Incorporate multimedia elements, such as videos, quizzes, assignments, and discussion forums, to encourage active participation and interaction. Provide personalized feedback and support to address learner questions and concerns promptly. Foster a sense of community and belonging among your students by facilitating peer-to-peer collaboration and networking opportunities. Regularly solicit feedback from your students and make adjustments to your course based on their input to enhance the overall learning experience.