what are some things the men say they learned in school? according to paul, what are the three valuable lessons no one taught them in school?

From the text, the things the men did not learn in school.

"At school nobody ever taught us how to light a cigarette in a storm of rain, nor how a fire could be made with wet wood--nor that it is best to stick a bayonet in the belly because there it doesn't get jammed, as it does in the ribs."

Things they learned.....

"...the three-fold theme in "William Tell'.

"...the purpose of the Poetic League of Gattingen..."