It breaks down emotional skills into personal competence skills -- self-awareness and self-management -- and social competence skills -- social awareness and relationship management. It's accompanied by an online assessment that gives you a score in each of the four areas, and helps you devise a plan to improve in the areas you need. It also discusses over a dozen strategies in each area that you can practice to improve.
So far, I really like it, it's very straightforward and the strategies it offers are really concrete and not terribly difficult to practice. My partner is also reading it, to support my own efforts (I need it more than he does), he is further along into it than I am and he's also been really impressed with it so far.
Make some time daily to think about interactions that you've had that day. Don't necessarily draw conclusions. If you take up a natural interest in the chain of events of human behavior, you'll start identifying various events and how they correspond to emotions/etc in context.
Also, observe what other people do, decide if you want to act that way, and then try it yourself.
IMO the best you'll get is a distribution of probabilities for what a particular event means, so don't expect hard and fast rules, but sometimes that's enough.