三心哥的好帖我都收藏在书签里珍藏着的，我能看到，不知道copy link为什么看不了。

我把原帖copy paste 到这里吧。

• ratio put spread: Used when stock sold off towards bottom of a wave, the purpose is to buy more shares at lower price
• put spread: Used when stock is at high point of a wave, the purpose is to profit from the potential decline
• call spread: Used when stock is near the bottom of a wave, the purpose is to profit from the potential bounce
• ratio call spread: Used when stock is near the high of the wave, the purpose is to lower the average cost of the main holding when stock drops , plus willing to sell with better profit if it keeps going up