How do I trade expiry days in Nifty options?

On expiry day, time decay (theta) is maximum. OTM options lose value rapidly. The best strategy is to be a net option seller on expiry day, not buyer.

Avoid buying OTM options on expiry morning. If you are a buyer, only buy ITM options with clear directional bias. The safest approach for beginners is to square off positions by Wednesday.