learning to learn 的意思是“学会学习”。前面一个 learn 是“学会”，后面一个 learn 是“学习”。learn to do sth 有两个意思：一是表示“学习做某事”，二是表示“学会做某事”。如：

Emily is just learning to write. 埃米莉刚刚开始学写字。

She had great difficulty learning to read and write. 她学习读写非常吃力。

I bought a new car in order that my wife might learn to drive. 我买了一辆新车，以便我妻子学习驾驶。

Children must learn to behave at table. 小孩必须学会吃饭时的规矩。

It’s important for people to learn to read. 人们学会阅读是重要的。

While most children learn to read easily, some need extra help. 大多数儿童学会阅读很容易，有一些儿童却需要特别帮助。

We live in a changing world and people must learn to adapt. 我们生活在变化着的世界里，人们必须学会适应。

As a teacher, you should learn to set an example with your own conduct. 作为一名教师，你应该学会以身作则。

For a marriage to succeed, both partners must learn to give and take. 要使婚姻美满，双方必须懂得互相迁就。