〜には (in order to, for)
to (do), for (doing), in order to
Verb dictionary form + には + evaluation / requirement
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には after a dictionary-form verb means "for the purpose of doing": 駅に行くには、このバスが便利です, "to get to the station, this bus is convenient".
The second half is a judgement or requirement: 便利だ, 必要だ, いい, 難しすぎる, 大切だ, 〜がいちばんだ. That's the difference from ために (N4), which leads to an action you take.
It also means "for (doing)" with difficulty or suitability: この本は子どもが読むには難しすぎる, "this book is too hard for children to read".
ためには and のには mean much the same. In grammar questions, if the second half is an evaluation or a requirement, には is usually the answer.
Examples
駅に行くには、このバスが便利です。
To get to the station, this bus is convenient.
日本で働くには、ビザが必要だ。
To work in Japan, you need a visa.
この本は子どもが読むには難しすぎる。
This book is too difficult for children to read.
健康でいるには、よく寝ることが大切だ。
To stay healthy, sleeping well is important.
富士山に登るには、夏がいちばんだ。
Summer is the best time for climbing Mount Fuji.