@Alvin Leong I started learning butterfly spreads with Gavin McMaster's "Bullshit Free Guide to Butterfly Spreads" (2.99 on Amazon, can pick up for free too). He runs optionstradingiq.com. It is definitely a beginning book, but he lays out a bunch of different variations. His main butterfly trade is a Bearish butterfly, which looks for overbought markets and profits from a slow uptrend and a then a pull back. Thetatrend.com has a lot of info too, it isn't updated anymore as owner got a job trading.