Been a while since I visited this site hello Hikarins

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搭子文化 is an interesting sociocultural phenomenon within China today where people make friends based on their social status in life
https://en.wikipedia.org/wiki/Dazi_culture
https://www.wenlinshe.com/tw/ this is a very cool library with a lot of classics and idioms that could be useful
http://www.robos.org/sections/chinese/cangjie.html this provides information on cangjie which is a useful system to type Chinese and makes use of the radicals, with keys mapped to them
「 夫禍富之 轉而相生
其變難見也 」
「 Disasters and abundance take places with one another
It is difficult to make certain 」
These are two lines from the 淮南子 about the old man near the border who had lost his horse. It is a pretty famous parable, and parables, addages, or idioms in Chinese are often referred to as 成語
https://sites.google.com/site/wenzhoudialect/anthology/baidu-wenzhou-dialect this regards "Wenzhounese" a division of Wu Chinese, which is also close to Shanghainese. Wenzhounese is famous for it's uniqueness, with around eleven tones, with phrases describing it discussing it's remoteness "天不怕,地不怕,就怕温州人说温州话" "Fear not the heavens, nor the earth, but the Wenzhou man speaking Wenzhounese. It is regarded as one of the devil dialects.
https://github.com/ZWolken/Great-Dictionary-of-Modern-Chinese-Dialects/blob/main/%E5%B9%BF%E5%B7%9E%E6%96%B9%E8%A8%80%E8%AF%8D%E5%85%B8.pdf this is a document regarding a 2002 compilation of the fourty two modern Chinese dialects
躺平 is a term used to mean "lie flat" and it is mostly a word used by a lot of NEETs in China, kukuku is an example of an old Chinese imageboard, although their culture is very isolated
https://english.shanghai.gov.cn/en-LearnChinese/index.html a useful site from the Shanghai government
I also learned about tone sandhi, where the tones change regarding the context and the previous tone that precedes a phrase, it is pretty strange and hard to figure out
https://opentext.ku.edu/tingyiting/chapter/lesson22/
邯郸学步 is a unique phrase that I relate to, it warns one to not copy another person blindly, and regards the Handan walk, which was sort of an old trend in ancient China
https://www.straightdope.com/21343499/is-the-chinese-word-for-crisis-a-combination-of-danger-and-opportunity there is a lot of discussion on whether the Chinese word for disaster is a combination of danger and opportunity
There is also an obscure practice where Chinese characters are used and picked as a form of Astrology, there are few pages on it
https://www.stronghold-nation.com/history/myth/literomancy
There is a lot of use of seals or chops within businesses in China, and it's often discussed in the legal context, it is sort of like a more official signature compared to ordinary 签字/
https://harris-sliwoski.com/chinalawblog/is-that-a-real-chinese-company-chop-stamp-seal/