When you take a positive view on a stock or option you buy option. When you take a counter positive view, you sell options. Selling options has limited upside and unlimited downsides. If you thought people must be crazy to sell options, think again! 95% of all options expire worthless. That means, in 95% of the cases, it is the seller of the option who makes money. But selling options is for the experts. If you try selling options without knowing the downside risks, it could spell disaster for you. Overnight risk is quite huge on selling options.