In most European countries, the correct way to wave hello and good-bye is palm out, hand and arm stationary, fingers wagging up and down. Common American waving means no except in Greece, where it is an insult.The idea is to help Americans behave better abroad.
Here's tip number two: Smile. Genuinely. couldn't be simpler. I wish I'd known that before now. Or, here's another one: Be quiet. I doubt I could have done that even if I'd known it was a good idea.
Wow! So much to learn. And, I haven't even seen the full guide. The abridged version is all that's available online.
I have to go now, but I'll be practicing my waving the rest of the day.