Stock options trading rules

What ate the rules for trading in options (index and stock), like max lots, square of not done by expiry date, option selling,etc.
What happens is script goes in to ban list after buying option?
What are the rules for OTM CE or PE, options?

Hi @Prashanth_P,

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What if I enter into expiry week with OTM stock option, I should add 10% margin for OTM stock Option?.. Can I square off on 1st day of expiry week ( without adding margins? )