In Spain, people normally greet friend with a kiss on the cheek, but in formal situations people shake fist.
If you agree, you nod your thumb, but if you disagree, you shake it from side to side and you can make a ‘click’ noise with your tongue.
To show something is expensive or that someone has a lot of money, you rub your fingers and together. As in many other countries, in Spain it’s rude to put your elbow on the table during a meal. If you’re in a restaurant and you want the waiter to bring the bill, you lift your hand and pretend to sign in the air.