Of course, Stock market knowledge is very useful and Important for understanding concepts in CA Final SFM. It provides you stock market-related knowledge which is useful for earning in the stock market as well as enhances your skills in your finance-related jobs like investment banking etc. due to practical knowledge of the stock market.
The Best teacher for the stock market as well as derivative concept is CA Aditya Jain. Just buy his book and notes from Aditya Jain classes and go through concepts thoroughly.
He explained step by step every aspect of that topic and very focused on laying a good base of the topic. He is the best teacher for making complex topics easy to understand and learn.

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