Lessons learned is better.
Both "lessons learnt" and "lessons learned" are correct phrases, but "lessons learned" is more commonly used in American English, while "lessons learnt" is more common in British English. Ultimately, both can be used interchangeably without issue.
learned
the answer is everyting
Two of the lessons learned by the Union Navy were to seize ports and embargo trade and blockade.
The past tense of "learn" is "learned" in American English and "learnt" in British English.
After a war, people in poverty "often" will regain there foothold on living standards by learning from their observations learned during the war. They will put "lessons learned" to use.
You can use either term. 'Burned' and 'burnt' are variations on the same word, just like 'learned' and 'learnt'.So you could say, 'The candle had burned out', or 'The candle had burnt out'.
He learned better.
They learnt from their family as they grew up, they learnt on the job, they learnt in the school of hard knocks, the warriors learnt in the regular practice call-outs.
You can use either term. 'Burned' and 'burnt' are variations on the same word, just like 'learned' and 'learnt'.So you could say, 'The house burned', or 'The house burnt'.
You can use either term. 'Burned' and 'burnt' are variations on the same word, just like 'learned' and 'learnt'.So you could say, 'They were worried the cake had burned', or 'They were worried the cake had burnt'.
You can use either term. 'Burned' and 'burnt' are variations on the same word, just like 'learned' and 'learnt'.So you could say, 'Don't get burned', or 'Don't get burnt'.
You can use either term. 'Burned' and 'burnt' are variations on the same word, just like 'learned' and 'learnt'.So you could say, 'The car smelled of burned rubber', or 'The car smelled of burnt rubber'.