From a perspective of an Indian student in Germany, I have a list of it.

1. Always carry cash. Cash is the most preferred method of payment. From Döner Shops, getting a haircut, having a coffee in a posh café to buying something from a kiosk— you need cash. E-wallets are accepted very less and only big supermarket chains accepts cards.
2. Make good use of the amazing the public transportation. If you’re living in one of the major german cities, you don’t have to own a car. Germany’s excellent transportation system provides you end to end connectivity and is mostly on time.
3. Sunday’s are off. From grocery stores to malls to pharmacies, nothing is opened on a Sunday. You need to plan ahead for your weekend and buy stuff beforehand.
4. Varieties of bread and beer. Visit a German supermarket and you will be overwhelmed by the sheer variety of bread and beer. The bread you get in the supermarkets are very fresh.
5. Nudity is a part of the culture. In summer, especially, you’d see men and women lying naked in open at a beach or a lake.
6. The country is very pet friendly. People love their pets and they can carry them in buses, trains or metros.
7. Very less or no use of Air conditioning. The German U-bahns, especially, in Berlin, do not have A/Cs. It can be very difficult for sometime in summers to travel in them.
8. Being on time is expected and respected. And if you’re not on time, it is considered extremely rude.
9. Slow internet. This may come as a surprise. The internet in Germany is quite bad. Both broadband and mobile data are quite slow and expensive.
10. No small talk and conversations are quite direct. If you’re not used to people being direct, you might perceive it as rude. But they’re just being honest and leave no scope for misinterpretation.
11. Blowing your nose in public is completely fine and nobody would give you a weird stare for that.
12. Drinking in public is very common. And so is smoking.
13. You have to pay an extra amount on alcohol and other bottled or tinned beverages called Pfand. You can redeem your money by recycling it in any of the supermarkets.

All in all, my experiences so far have been positive in this beautiful country. The society is very civilised and people are nicer. Learning the language would make it more easier and comfortable.