Many F&O traders normally are confused between buying a put option versus selling a call option. Broadly both are bearish strategies and the difference between a call and put option is that while the former is a right to buy the later is a right to sell. Obviously when you buy an option your risk is limited to the premium you pay. That is because your loss is limited to the premium paid while your profits can be unlimited. On the other hand when sell an option, your income is limited to the option premium received but the losses can be technically unlimited. While buying is a direct negative view on the stock, selling a call is a negative view on the upside of the stock. There is a subtle difference and it depends on your view of things.