关于【guānyú】

关于 names what something is about. The 关于 phrase goes in front of the noun it describes, joined by 的, or at the very start of the sentence as its topic.

Before a noun

A book, film, question or meeting "about X" puts the whole 关于 phrase before the noun, with 的. English puts "about X" after the noun; Chinese never does.

• × 一本书关于中国 → 一本关于中国的书

At the start of the sentence

A 关于 phrase with a comma after it sets the topic, and the rest of the sentence comments on it. It goes before the subject, not after it.

• × 我们关于这个问题谈了很久 → 关于这个问题，我们谈了很久

Verbs that already mean "about"

谈, 说, 讨论 and 问 take what they're about as a direct object, so "talk about him" needs no 关于.

• × 我们说关于他 → 我们在说他

关于 or 对于

关于 names a subject. 对于 names the thing an attitude or action is aimed at, and can go after the subject; see 对于.