Ne...personne (nobody/no one) works like the other two-part negations but with one difference: in a compound tense, personne moves after the past participle rather than staying next to the auxiliary — je n'ai vu personne (I saw nobody), not je n'ai personne vu. Personne can also start a sentence as the subject: personne ne sait (nobody knows).
Ne...que isn't a true negation at all — it means "only", restricting rather than negating: je n'ai que deux euros (I only have two euros). Que goes directly before the thing being restricted, and unlike real negations, an indefinite article after que doesn't change to de: je n'ai qu'un frère (I only have one brother), not je n'ai qu'de frère.