Learn Croatian: Često raspravljamo o politici.

The base word is politika. The preposition o (about) requires the locative case, which changes the ending to -i for feminine nouns. In Croatian, when the letter k is right before an i, it changes to c. This common sound change is called sibilarization.

In English we say 'discuss politics' without a preposition. Why is o used here?

Unlike the English verb 'discuss', the Croatian verb raspravljati requires the preposition o (about) followed by the locative case. You are literally saying 'We discuss about politics.'

Is politici a plural word, since 'politics' ends in '-s' in English?

No, politika is a feminine singular noun in Croatian. Politici is its singular locative form. English often uses plural-sounding words for concepts like politics or mathematics, but Croatian treats them as singular.

Why does this sentence use an imperfective verb?

The verb raspravljamo (we discuss) is imperfective, meaning it describes an ongoing or repeated action. This matches perfectly with the adverb često (often), showing that this is a regular habit rather than a completed, one-time event.