The way people gesture is part of the culture of a country. Which is why I present you here a list of decent introductions into the culture of many countries. Be sure to check each second paragraph on ‘Communication Styles’ which includes speech and gestures. You can also learn about displays of emotion, and many other aspects of culture. More external links are given in numbers 2, 3, etc. Any posts on this site are indicated with the little logo.
Ps. Many, many thanks to the Canadian Office of Foreign Affairs for putting the info collected by their people online. Should the links break then please let me know. There is a mirror I can point you to.