What are some of the unspoken social rules or etiquettes in Gemany that may not be commonly known to the average foreigner?

The fact that there is a lack of resources in many parts of the world is a problem that has to be addressed. Many parts of the world lack resources, which needs to be fixed.

In Germany, the wink emoji is used to express humor and is not meant to be flirty.

It's not a good idea to wish someone a happy birthday before their actual birthday day. However, you can start the celebration the night before. Just make sure to wait until after midnight to give your birthday wishes.

In German, "Not bad" is the highest form of praise.

Americans should be aware that in Germany, "friend" is not something to be used lightly. We take it seriously when someone says that they are your friend, and if you invite them over, they will expect you to follow up and decide on a date.

If you're in a German sauna, be aware that it's usually both mixed-gender and nude. This is not an invitation to be sexual or body shame anyone. Also, be aware that "Saunaclub" is generally a term for a brothel, so do your research before going.

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Don't just ask "how are you" out of politeness; be prepared to receive a more in-depth response than a simple "I'm fine, and you?"

Always use the warentrenner at the checkout in supermarkets. If the person behind you can't reach them, placing one behind your items will make them very happy.

Don't stay in a bike lane when you're not riding a bike. I figured that out fast during my initial visit. A German cyclist won't hesitate to ring the bike bell if they're angry.