What does ne or se mean?

I don't know fo any meaning for "ne", but "se" can be several things. It is an impersonal pronoun used to give impersonal, generalized meanings. Se habla español is a way of saying "Spanish is spoken". It is also a reflexive pronoun, where the action of the verb "reflects" on the subject. Used with an accent, sé, it is the first person sungualr of the verb saber, or "I know".