can someone help me ? don't move and do not move . some different between that sentences or only shortcut when speaking and writing ,thank you

there is no difference in these two words.
but if we want to use donot in interrogative but negative sentence
then we shall use don't in the beginning sentence.

Don't you know the difference ?

do you not know the difference ?

(both sentences are correct and meaningful)

Is a lesson on contractions.

Although they mean the same thing the foreground emphasis is different,'Don't move' being quicker to say creates more urgency and drama than 'Do not move'.