General Chinese Thread

I was learning chinese for a year or something.
But I still have a lot of questions.

for instance what variant is correct

1) 我少会说中国
or
2) 我会少说中国

你好，/lang/

Can anyone tell me the main differences between 不 and 无? My Chinese professor has told me that the latter is not used in modern Chinese, but this tells me nothing about the actual meaning of it.