There are many subtle behaviors you should take note of when interacting with the locals. It is not highly emphasized, but rather, encouraged. The following are a few you should try to follow:
It is considered rude to put your hands in your pockets when talking to someone.
The “okay” sign (index finger and thumb jointed together to make a circle) is considered a rude gesture as well.
Germans highly value punctuality. Try your best to not be tardy for any meetings or gatherings, as it considered extremely thoughtless and rude.
Nobody drinks at a dinner party before the host has drunk. The host will raise his glass to the woman on his right and then toast to the health of the group.
Guten Appetit is said before eating and means “enjoy your meal”. It is the host’s way of saying, “please start”. Guests can respond by saying Guten Appetit or Dankeebenfalls, which means, “thank you.”
Don’t lose your temper publicly. This is viewed as uncouth and sign of weakness.
Don’t be offended if someone corrects your behavior (i.e., taking jacket off in
restaurant, parking in wrong spot, etc.). Policing each other is seen as a social duty.