"Should not" is the full form, while "shouldn't" is its contraction. Both convey the same meaning, indicating that something is not advisable or appropriate. The choice between them often depends on the formality of the context; "should not" may be preferred in formal writing, while "shouldn't" is more common in casual speech.
you shouldnt
no they shouldnt
They shouldnt
We shouldnt
No it shouldnt
no they shouldnt
no you shouldnt
they shouldnt
Go to the doctors, they should tell you what you should do, and what you shouldnt.
No you shouldnt.
you shouldnt brake it
they shouldnt it was a terrible battle