To let the card out of sight
Not in a restaurant, not in a store, not anywhere elsevbvccshop. Especially abroad. The map and the person holding it should always be in your field of vision. It is enough for an attacker to take a photo of your card from both sides on a mobile phone so that they can make (even very large) purchases.
In a cafe or restaurant, I always ask you to bring the card payment terminal to the table. If, for some reason, it is impossible to do this, then I go to the terminal myself validshopru(to the checkout). Always.