How to use SPAN calculator for option trading

#1
I am new to option trading and while learning about option i came across Zerodha's Span calculator. But i really dont know how to use SPAN calculator for optional trading?

I used nifty November contract as a put option and used 8100 as strike price for BUYing. But when i added my result nothing happened?


NIFTY15NOV Options 8100 PE 75 B N/A N/A N/A
whats happening?

Also can you share some simple tutorials regarding option trading and its strategies in indian markets
 

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