Last time I described some foods which are special to Japan. Rice is very common throughout Japan, China, and the other countries of southern Asia. A local specialty is mashed rice, which is prepared in a special ceremony where two people stand on either side of a vat of cooked rice. I took a turn myself. It is the custom in many countries in this part of the world to take off your shoes when you enter someone's home - even your own.
People generally have slippers available for family members and guests.
Many homes do not have carpet. Some have totems. Tatamis are decorative but don't do much to keep your feet warm. In the United States when you meet someone new or see someone who you have not seen for a while it is our custom to shake hands. Here in Japan it is the custom to bow slightly at the waist.