The 110 techniques of communication and public speaking | David JP Phillips | TEDxZagreb

The five top skills are: 1) always keep an open body language, 2) move forward instead of backward when talking about positives, 3) do functional gestures (but do not lock your hands), 4) a slower pace of speaking feels more important, and 5) use pauses to emphasize your important bits (and never do "eeh", "aah", or alike).
Then Dr. Phillips showed 4 subtle skills that you rather have to watch on your own, from 12:34