1. Nouns

Unlike English nouns, all German nouns are capitalized. This is very useful as you learn to read German. You can easily identify the nouns in these two sentences:

Der Mann hat einen Bruder und eine Schwester, aber keine Eltern mehr. Die Frau hat keine Schwestern und keine Brüder, aber zwei Tanten.

Of course, the first words of each sentence are also capitalized. Der and Die are articles, not nouns.