Learning Italian hand gestures

I talked to a friend of mine about learning Italian language and people's habit, then a video clip I've watched some time ago came to my mind. It's a funny one but I admit that at the beginning when I transferred to Italy, I found their way of conducting hand gestures while speaking a bit ridiculous. However, I think it's useful knowing what the gestures mean. Each nation has its own customs!

credit to the US Consulate at Milan