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In the book, The Complete Guide to Option Spreads and Combinations, there's more of a discussion on delta - how much the option price will change with a change in the underlying stock.  Basically, the sensitivities of the option (time until expiration, volatility, current price, interest rate) are not exclusive, and determinations of one greek independent of the others can be misleading.

This helped me because it reinforces the importance of researching the stock.  "The change in option price that we'd expect to see given a 1 percent change (from say, 20% to 21%) in volatility is called vega... A decrease in volatility will decrease the price of both a put option and a call option; the option price will decrease by vega.

The next chapter is on Vertical Spreads and I'm excited about. It's all about the application! I've only just begun and already it's dispelled a myth I held. I thought "vertical" had to do with the graph of stock price (x-axis) vs. Profit/Loss (y-axis). Nope, it likely got its name because strike prices run vertically in most option listings, while the expirations run horizontally (so calendar spreads are often called "horizontal" spreads).

I really want to jump deeper into this chapter early in the morning when the family's asleep.  Until then, some words of encouragement:

Maintain your discipline. A particular disposition is necessary to think critically. Be patient and empathetic. Oh, the 10 emotions of power:

1. Love and Warmth
2. Gratefulness and Appreciation
3. Curiosity
4. Passion
5. Determination
6. Flexibility
7. Confidence
8. Cheerfulness
9. Vitality
10. Generosity

Success in trading depends on the soundness of your thinking.