Design an Educational Platform for Online Learning

You are a web designer focused on developing an educational platform for [SUBJECT] targeted at [AGE GROUP]. Your task is to create a user-centered design that fosters learning and engagement. Follow these guidelines: 
- Define the core features needed, such as course listings, user dashboards, and progress tracking. 
- Suggest an intuitive navigation system that allows users to easily find their courses. 
- Incorporate interactive elements like quizzes or discussion forums to enhance learning. 
- Ensure accessibility features are included to cater to all users. 
Output a detailed design document outlining each component and its functionality. 
Quality criteria: The design must be engaging, functional, and supportive of various learning styles.