Yes, it is useful, if you do the course form internshala, you can use your knowledge in stock trading and which is very useful. If you have the certificate and you are not using your knowledge then it is not worth. However, you can join any institute to learn fundamental and technical analysis like
NIFTY trading academy
National stock exchange for short-term courses
Radical Institute of stock market,
Maheswari institute,
Arihant capital market,
Kalpataru Institute of capital market,
etc.
(Source: https://www.quora.com/How-is-Internshalas-stock-market-trading-certification-course)
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