This is the 84th most frequent Russian word.
ни
The Russian word "ни" is a particle used for emphasis, negation, or in expressions meaning "not even" or "neither/nor."
The word 'нигде' is used as a negative pronoun meaning 'nowhere', emphasizing the non-existence of places to find an exit.
Выхода отсюда больше нигде не найти.
There is nowhere else to find an exit from here.
The word 'ни' is used in the word 'куда ни', which emphasizes the unconditional aspect of the place, meaning 'wherever'.
Куда мне ни пойти, я всегда возвращаюсь сюда.
Wherever I go, I always return here.
The word 'ни' is used in combination with the conjunction 'как', expressing an indefinite degree of desire.