In standard English, you use only one negative word to make a sentence negative. Using two (for example don’t + nothing) is called a double negative, and it is a mistake.
A double negative is when two negative words (like not, don’t, nothing, never, no one) are in the same part of a sentence.
You may hear double negatives in songs, films or very casual speech. But in standard English (at work, in writing, in exams) they sound wrong, and some people may even understand the opposite meaning.
Use only one negative word. After not, don’t, didn’t or never, use an any- word: anything, anyone, anybody, anywhere, ever.
Or keep the verb positive and use the negative word: I know nothing about it.
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