If you are interested in reading people and recognizing lies, you will sooner or later stumble over how to interpret the facial expressions of the basic emotions.
You might ask, “Wait, why do I need that? I read faces all the time.” And you’re right, most of the time our brain automatically reads the basic emotions of other people, at least the so-called macro-expressions.
Sometimes, however, this ability is subject to errors: you can confuse certain expressions or not recognize them at all. You’ll do better by becoming aware of what those emotions look like on people’s faces.