Double negatives - the use of two 'no' words such as not and nowhere in one sentence -
are incorrect in standard English.
In many dialects and vernaculars, they are quite frequent.
Vernaculars (ways of speaking to indicate you belong to a particular group) are quite tricky.
It is relatively simple to learn to use 'wrong' double negatives.
Yet there are many other unwritten rules. If you make a mistake, you are 'out' immediately.
It's like your teach trying to speak like a 16 year old.
When modifying something use either a 'no' word, or 'any' as explained in the following sections.
Examples:
| He doesn't like anything. | or | Angela hasn't visited anyone this month. |
| Angela hasn't visited anyone this month. | or | Angela has visited no one this month. |
| She isn't going to travel anywhere. | or | She's going to travel nowhere. |