Thank you for posting this practical introduction to an important topic, in simple English, for a large audience.

By the way, several studies in communication indicate that body language (non-verbal) language is even higher than you state. Several experts believe it is over 70% of communication. When watching mock job interviews, I often watch twice - once with the sound on and once with it off. Likewise, just listening to the exchange and ignoring the images can dramatically alter your impression of the interview. Far too many international students seem unaware of the importance that Americans place on body language.

Good job!