Sunday is sacred (and closed)
Almost everything is closed on Sundays — shops, supermarkets, hardware stores. It's the law. Gas stations and some bakeries are your emergency options. Plan Saturday shopping carefully.
Tip: Quiet hours (Ruhezeit) apply on Sundays. No drilling, no loud music, no mowing. Some neighbors take this very seriously.
Cash is still king
Germany loves cash. Many restaurants, bakeries, and smaller shops are cash-only. 'Nur Barzahlung' (cash only) signs are everywhere. Always carry some.
Pfand — the bottle deposit system
Most bottles and cans have a deposit (Pfand) of 8–25 cents. Return them at supermarket machines. Some people leave bottles by public trash cans for collectors — this is considered polite, not littering.