Your new local habits in France

Top of the list of things to know about living in France is the importance of la politesse. Whenever you walk into a shop, or a doctor's waiting room, or anywhere else that is public-but-private, always say "Bonjour". Before opening a conversation, however ephemeral (e.g. asking for directions in the street), say " Bonjour." On leaving, or concluding a conversation, wish people "bonne journee" or "apres-midi", or " soirée", or (if appropriate) "continuation".
Before complaining, no matter how hopping-mad you might be, say " Bonjour". And if you do need to complain, be as painfully polite as you know how; this will earn respect, whereas yelling instantly disqualifies you from any right to be heard.
I was reminded of this the other day, when an American tourist barged in front of me in a shop - not to buy something, just to ask a question. The whole place - including me - was shocked by his (c)rudeness.
I do not live in Paris, however - far from it - so I cannot speak for the Parisian way of life, which virtually all non-Parisians do not admire.