There are lots of online websites who provide online courses of stock market like
Couresera
Udemy
Sharemarketshiksha
Nifty trading academy
You have to choose courses wisely because there are many company or website which they fail to fulfil their promises. Choose and review every course.
(Source: https://www.quora.com/What-are-some-of-the-best-online-stock-market-courses-available-in-India)
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