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I am thinking about researching some various Chinese topolects (方言).
Are questions on the grammars and vocabularies of Wu, Hakka, Cantonese etc on topic here?
I honestly don't see why not. There are already such questions on the site, so go ahead. Make sure you tag your question with the relevant tag such as hakka or cantonese.
Yeah. I can help you with most Mandarin, Cantonese problems, some Hakka but I haven't speak it for like 5 ~ 6 years.