Learning Agility is defined as the ability and willingness to learn, largely from experimenting and new experiences. Practically speaking this means that it doesn't really matter what you decide to learn, just that you put it into practice. This puts the neural pathways in your brain into a learning state, so that new skills and knowledge can easily be integrated into your own, personal resource toolkit. It also means that reading 5 books on management is better for your brain than just one, because your brain becomes more used to processing the information, and deepening the links to it.
However, until recently, learning was about going to school and then maybe higher education, before getting a job and staying in that same job for 40 years. There was no need for active learning because you were doing the same thing you did yesterday. In fact saying "I don't know" was a sign of weakness. This makes our current place of work considerably different from previous generations.
With the volume of change and uncertainty in our fast moving society described as VUCA (Volatile, Uncertain, Complex, Ambiguous) you have to develop a new set of skills to keep up with the changes in the business just to stay afloat.
As such, we require a Growth Mindset. We need to believe that we can always learn more, and identify ways to practice to get better, as well as actively seek out feedback as learning opportunities.