About with 关于

Structure 关于 + matter

关于 (guānyú) means "about, concerning" and introduces the CONTENT or subject of something: 一本关于历史的书 = "a book about history". Unlike 对于 (which frames an attitude toward a topic), 关于 indicates what something is ABOUT. It opens the sentence or modifies a noun.

Examples

这zhè是shì一yī本běn关guān于yú历lì史shǐ的de书shū。
This is a book about history.
关guān于yú这zhè个ge计jì划huà，我wǒ们men再zài讨tǎo论lùn。
About this plan, we’ll discuss it later.
关guān于yú这zhè件jiàn事shì，我wǒ什shén么me都dōu不bù知zhī道dào。
About this matter, I know nothing at all.

Levels are indicative: they follow the standard Chinese Grammar Wiki (AllSet Learning) progression, not an official HSK 3.0 mapping. We never assign levels by eye.

This point and the other 370, with audio on every example, inside Wanyu.