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1. https://digitaldefynd.com/best-free-certification-course-training-online/
2. https://digitaldefynd.com/best-courses-for-learning-bitcoin-earning-mining-and-trading/
3. https://www.futurelearn.com/
4. https://www.thoughtco.com/online-computer-classes-1098078
5. https://www.onlinecoursereport.com/30-most-lucrative-skills-you-can-learn-online/
6. https://www.gobankingrates.com/making-money/entrepreneur/money-making-skills-can-learn-less-year/
7. https://afterschool.my/ask
8. https://www.thepennyhoarder.com/make-money/get-paid-to-learn/
9. https://www.learnyst.com/pricing-teach-online
10. http://indiamicrofinance.com/top-5-indian-bloggers-2015.html