Learnings is a plural version of a singular noun that does not exist. And there's already a perfectly good word you can use to get at what it attempts to communicate, namely lessons. (You can even call them lessons learned if you absolutely must shoehorn the idea of learning in there.)
* http://grammarist.com/usage/learnings/
* http://www.johnsmurf.com/jargon.htm
* http://www.dailywritingtips.com/what-the-heck-are-learnings/
* http://customerthink.com/16_marketing_terms_to_ban_in_2011/
* http://valleywag.gawker.com/dear-dummies-learnings-is-not-a-...
* http://www.ragan.com/Main/Articles/9_completely_pointless_co...
Learnings is a plural version of a singular noun that does not exist. And there's already a perfectly good word you can use to get at what it attempts to communicate, namely lessons. (You can even call them lessons learned if you absolutely must shoehorn the idea of learning in there.)