Here are a few tips that might help you to avoid embarrassment when you first arrive in Germany. Punctuality is probably the most important virtue in Germany and you should take it seriously.
You should also make eye contact when toasting – if you don’t you’ll have bad luck. When invited to someone’s home, bring a small gift like a flower, home decoration or alcohol.
When it’s your birthday, you might be surprised that you will be expected to pay for food and drinks for your guests, rather than the other way around.
SOURCE: deutschdrang . com/dir/traveling-to-germany/
