Meaning:

• "Don't . . . !" "Do!" : negative imperative
泣くな！ Don't cry!
危ない所へ行くなよ。Please don't go to a dangerous place.
 
• "I wish," "It would be nice if . . . "
あの車、ぼくも欲しいな（あ）。I want that car, too.
 

Location:  Behind V-dictionary

じゃまするな。Don't get in my way.

Gender:   Mostly men use this particle.

Level:  Informal

Alternatives:

• Women tend to use V-ないで instead.
じゃましないで。 Don't get in my way.
 
• A formal alternative is なさい.
勉強しなさい！ Go study!

Warning: 

※な is strongly negative and is used only in highly emotionally charged situations.

※よ after な softens the negative imperative.
            泣くなよ。Please don't go to a dangerous place.