E.g. If I am net long in my portfolio and I fear some headwinds I can buy a put or two for the peace of mind. Now those puts should be always considered as worthless, and it is just the price to pay for the peace of mind.
Similarly you sell options. Trading options on the other hand is just pure gambling. Even if you get the direction right you likely won't get the timing right (or the volatility).
edit: typo