1. **Bull Call Spread**: A bull call spread involves buying a call option at a specific strike price while also selling the same number of calls at a higher strike price. This strategy is used when a moderate rise in the price of the underlying is expected.

2. **Bear Put Spread**: A bear put spread involves buying put options at a specific strike price while also selling the same number of puts at a lower strike price. This strategy is used when a moderate decline in the price of the underlying is expected.

3. **Butterfly Spread**: A butterfly spread involves buying a call at a lower strike price, selling two calls at a middle strike price, and buying a call at a higher strike price (or similarly with puts). It’s a neutral strategy that profits when the underlying price stays within the range of strike prices.

– Reference: [Investopedia: Bull Call Spread](https://www.investopedia.com/terms/b/bullcallspread.asp), [Investopedia: Bear Put Spread](https://www.investopedia.com/terms/b/bearputspread.asp), [Investopedia: Butterfly Spread](https://www.investopedia.com/terms/b/butterflyspread.asp)