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As far as I know, learned and learnt can be both used.

Well, as I was typing the above my auto-correction crossed out learnt :)​

I get no red squiggly line underneath 'learnt'.

Learning exactly is the most important and the most beautiful thing ever, even easier with steemit :)

Better than learning is understanding?

You made me doubt the word for a while then but @imransoudagar called it, learned is American and learnt is British, hence why I used learnt.