I asked Bard, what is the difference between lessons and learnings? Response:

The main difference between lessons and learnings is that lessons are more specific and measurable, while learnings are more general and abstract.

Lessons are the specific things that we learn from our experiences, both positive and negative. They are often concrete and can be easily identified and articulated. For example, a lesson learned from a failed project might be "Don't underestimate the importance of user testing."

Learnings are the broader insights that we gain from our experiences. They are often more qualitative and difficult to quantify. For example, a learning from the same failed project might be "It's important to be flexible and adaptable when things don't go according to plan."

Another way to think about the difference is that lessons are about what we did, while learnings are about why we did it.