Bread is a religion
Germany has over 3,000 types of bread. The local bakery (Bäckerei) is the heart of every neighborhood. Vollkornbrot, Brötchen, Laugenbrezel — breakfast without bread is unthinkable.
Tip: Bakeries open early (6am) and the best items sell out by mid-morning. Sunday bakeries are a thing — find yours.
Lunch is the main meal
Traditionally, Mittagessen is the big hot meal. Dinner (Abendbrot) is literally 'evening bread' — cold cuts, cheese, and bread. Many restaurants offer better-value lunch menus.
Beer culture varies by region
Bavaria drinks wheat beer, Cologne drinks Kölsch (in tiny glasses that keep coming), Düsseldorf drinks Altbier. Ordering the wrong beer in the wrong city is a minor social crime.