pertaining to关于 (guānyú) flags the topic a sentence is about — "about, regarding, as for." Used this way it opens the sentence, setting the subject up before you say anything about it: "As for X, …".
Structure: 关于 + Topic ,……
as for关于Chinese中国history历史I,我know知道的not much不多。
As for Chinese history, I don't know much.
as for关于your你的suggestion建议the boss,老板still还在considering it考虑。
As for your suggestion, the boss is still thinking it over.
Remember: pertaining to关于 + topic = a headline at the front of the sentence ("Regarding X, …"). It can't sit mid-sentence like English "about."
Watch out
- Many English "about"s are baked into the Chinese verb — say to chat聊you你(modifier / structural particle)的to work工作 ("talk about your job"), not to chat聊pertaining to关于….