1) buying cheap far out of money, near expiry naked puts or calls (gambling)
2) selling cheap far out of money, near expiry puts or calls (taking out a loan from the mob to pay yourself a salary)
3) a combination of the above but with varying expiration date and strike price (limited risk, low payout, essentially grinding)
Different market conditions have different strategies, you can make money in any type of market whether it trades flat, bull or bear.
Probably the most popular method is people selling essentially insurance to gamblers from #1. There's just no way that the market can crash overnight right?
You have to be lucky every time and the market needs to be lucky only once to end your trading career.
Looking back, I think buying stocks or index is really best for passive investors. If you want to spend a lot of time learning and trading options its going to become a full time gig.