Literatur

Ich lese gern deutsche Literatur.

I like to read German literature.

gern (gladly) is often used to express liking something.

Diese Bibliothek hat viel Literatur.

This library has a lot of literature.

viel (much/a lot of) is used with uncountable nouns like Literatur.

Er studiert Literatur an der Universität.

He studies literature at the university.

an der Universität (at the university) uses the dative case.

Die Literatur des 19. Jahrhunderts ist interessant.

The literature of the 19th century is interesting.

des 19. Jahrhunderts (of the 19th century) uses the genitive case.

Sie schreibt über moderne Literatur.

She writes about modern literature.

über (about) can take either accusative or dative, here it's accusative with 'literature' as the direct object of writing about.

Welche Literatur magst du am liebsten?

Which literature do you like best?

am liebsten (most preferred) is the superlative of gern (gladly).

Wir sprechen über klassische Literatur.

We are talking about classical literature.

sprechen über (to talk about) is a common verb phrase.

Dieses Buch ist ein wichtiges Stück Literatur.

This book is an important piece of literature.

ein wichtiges Stück (an important piece) shows agreement in gender and case.