When receiving a drink, you should always hold your shot glass with 2 hands. If the glass is too small to use both hands, you should hold it with your left and support it with your right.
You should also bow slightly when receiving the drink to show respect for the other person. If you’re drinking with close friends, you may choose not to observe this tradition of bowing.
Note: These rules are especially crucial if the person pouring you a drink is significantly older or more senior!