When greeting each other, people usually perform what the locals call “se faire la bise”, which means that they kiss each other on the cheek.
When visiting somebody’s house, the guests usually bring along a bottle of wine along with either bread, flowers, chocolates, or deserts.
Food varies by region, and most people in France enjoy cooking, as it is very important to them.
Hosts offer their guests “l’apératif”, which consists of pre-dinner drinks with salty foods such as chips or peanuts. People use this time to discuss what has been happening in their lives.

https://www.cia.gov/library/publications/the-world-factbook/geos/fr.html (Majority of information)
http://www.independent.co.uk/news/world/europe/frances-crisis-of-national-identity-1826942.html (Ethnic data)
http://www.insee.fr/fr/themes/tableau.asp?reg_id=0&ref_id=NATTEF02131 (Ethnic data)
http://countrydigest.org/france-population/#Ethnic_groups_in_France (Ethnic and religious data)
http://bit.ly/2e9Dtkk (Religious group data)
http://www.insee.fr/fr/ppp/bases-de-donnees/recensement/populations-legales/default.asp (City population data)
Wolfram|Alpha (Currency exchange data)
Information accurate to best of ability as of 4 November 2016
¹ It is illegal in France to collect data on ethnicity and religion, so these numbers are estimates, the most recent of which occurred in 2010.