Generally no is ні and not is не. But unlike "not" не can't be used in the sentence on it's own, it should always precede the thing it negates.
Я не йду - I'm not going. Я не люблю - I don't like
Ви йдете, а я ні - You're going and I'm not. Тобі це подобається чи ні? - Do you like it or not?