OK - if there 1 tip that keeps cropping up for first-timers it's to say "bonjour " on entering stores, shops etc. I get it. Funny, it's something we tend to do anyway, in my little unsophisticated part of the world.
Here's my question: How does one know when to use "Bonjour madame" & when to use "Bonjour mademoiselle" - without getting into trouble with les dames!? Sacre bleu! :)