Learn Farsi: او می‌گوید که با جادو مردم را گول می‌زند. - He says that he tricks people with magic.

The word که (that) acts as a bridge connecting a verb of speaking, like می‌گوید (he says), to the phrase that describes what was said. Just like in English, you can often drop it in casual everyday speech, but using it helps structure your sentences clearly!

I see the direct object marker را after مردم. Why is it used here?

را marks the definite direct object. Even though 'people' might sound general in English, in Farsi, collective groups like مردم (people) are usually treated as specific when they are the direct target of an action. Here, they are the ones receiving the action of being tricked.

How does the verb گول می‌زند work?

It is from the compound verb گول زدن (to trick or deceive). When conjugating compound verbs in the present tense, the present tense marker می‌ attaches only to the second part (the action verb زدن), making it گول می‌زند.

Why isn't the pronoun for 'he' repeated after که?

In Farsi, you don't need to repeat the pronoun او (he or she) because the verb endings already tell us who is doing the action. Both می‌گوید and می‌زند end in -د, which is the third-person singular ending.