[Grammar] Regarding a use preposition and article

[Joe333]

Sentence: Why are you giving wrong advice of/for deleting the windows folder ? It can cause trouble. Never ever try it, not even by a mistake ?

My question: What preposition, of or for, would be correct in the sentence ? My own feeling is preposition "of" but not sure. Apropos of the article, will the article "a" comes before the word mistake ? I don't think so, but countable and uncountable noun has confused me. Therefore, I'm asking.


Regards and thanks

 

[billmcd]

Sentence: Why are you giving wrong advice of/for deleting the windows folder ? It can cause trouble. Never ever try it, not even by a mistake ?

My question: What preposition, of or for, would be correct in the sentence ? My own feeling is preposition "of" but not sure. Apropos of the article, will the article "a" comes before the word mistake ? I don't think so, but countable and uncountable noun has confused me. Therefore, I'm asking.


In your example, "for" and "not even by mistake".