I flagged it as Offtopic. But it is correct. "Learnings" is at best a pointless affectation, like saying "utilised" instead of "used". At worst, according to the OED, it's not even a word.
Continuing the OT and heedless of the downvotes: I appreciate your efforts, but they can't help themselves -- so many people love using recently invented (and redundant) words because they think it makes them sound smart and hip. Sorta like people who think JS is an amazing language and love to sell that point of view.
I didn't like it when people started using "learnings", but I'm beginning to appreciate some subtle shadings it seems to have over lessons. It seems more discovery oriented, and less sure it's correct, or at least, less widely correct. Sort of like "hacky, working hypotheses, that we think are worth sharing."
The word you want is "lessons".