as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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generate a list of five popular apps to use for online education.
user
1. udemy: a platform offering thousands of online courses taught by experts;
2. khan academy: a non-profit organization offering free educational resources in various subjects;
3. coursera: a platform with hundreds of top-tier universities and organizations offering online courses and specializations;
4. edx: an open-source learning platform created by harvard and mit;
5. duolingo: an popular app offering interactive language courses.
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