1- In Ukraine: Don’t ever think about giving someone an even number of flowers for someone as a gift ”Ew3a!!”.
It is supposed in ukraine that giving even numbers of flowers are only for funerals, so take care while giving someone flowers as a gift as it might be creepy to give them even number of flowers.
2- Russia: Always remove your outdoor shoes when entering someone else’s home.
Before entering any house in Russia make sure of removing your outdoor shoes when entering someone’s home, even some people can give you slippers to wear specially for the house.
3-Thailand: Don’t touch someone’s head
As it is considered the most holy part of the body, It is disrespectful to touch someone’s head in Thailand so you must avoid touching someone’s head.
4-Japan: Don’t leave tips.
There is no tipping in any situation in Japan- cabs, restaurants, personal care. To tip someone is actually a little insulting; the services you’ve asked for are covered by the price given, so why pay more?
5-Mexico: take care while saying to some ¡salud!’.
It is considered rude if you fail to say ¡salud!’ (‘your health’) after a stranger sneezes.
So take care while saying to someone these words.
6-Malaysia: If you have to point, use your thumbs.
Do not point your forefinger at things. Instead point a thumb. Pointing a forefinger at anything is considered rude.
7-Brazil: Get the language right.
8-India: Don’t touch anything with your feet.
9- Kenya: Remember, Hakuna Matata is not just a Disney song.
10-Italy: Don’t turn down food.
When someone offers you food or drinks, especially if you’ve just eaten the dish being offered and that was cooked by the house lady, you’re supposed to accept or have a good/nice excuse for not doing so. Refusing is considered impolite or a sign you didn’t like it.
11-China: Don’t give clocks or umbrellas as gifts.
12-Morocco: Don't use your left hand.
There are some countries, such as Morocco, where the left hand replaces toilet paper. Thus, you will be labeled a filthy creature if you use your left hand to greet people or consume food. Use the right hand for these public activities in Morocco. Sorry, left-handed people.
13-Tanzania: Do not really handshake.
If they make a handshake it is just very brief and light, far from a firm handshake. Some youngsters like to make a handshake, then twist their thumb up and hold the palm. Or commonly, people will offer their wrist to be touched as a sign of greeting instead of a handshake.