Yesterday 24-May-2018, BANKNIFTY closed at 26016.18:
But something strange happened. See this image:
What is the problem?
Options on the expiry day after trading is over expire worthless if Out Of Money (OTM), or At The Money (ATM), or just have the intrinsic value left for options that are In The Money (ITM).
If you are trading bank nifty weekly options my bank nifty weekly course will help you a lot to trade bank nifty weekly either intraday or positional. You can use these properly hedged strategies to trade in stocks and nifty also.