re; "when you SELL an option you have to own the shares"...sorry...Not true*...
Doc...that situation is called writing Covered Calls (if we are talking calls rather than puts)...Options Can be written Naked (with No underlying Equity position)...Guess who Regularly Do That...??!
There is a myriad of options strategies...I know not all, nor do I practice but a few...
I DO have positions in the Jan. expiry though...so am watching closely...