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At the risk of sounding like an oblivious idiot, could somebody explain Che Guevara?

I try to be as aware of world events as I can, but for whatever reason, I was never really taught about Che Guevara. All I (think I) know is that he was a revolutionary in South America. Other than that, I know nothing.
gpt
Che Guevara was born Ernesto Guevara de la Serna in Argentina. His parents were fairly well to do. He was a sickly child (asthma) and lived in the dry climates to help this during his childhood. Once his family moved to Buenos Aires, he began reading the works of Karl Marx and other communist thinkers. He went to school to become a doctor but before finishing his tests, decided to embark upon a motorcycle journey of South America (it was on this journey he adopted the name 'Che', which is Argentinian for 'Hey', as in hello)
. Whilst on this journey, he saw the plight of the common people and vowed to fight for them (according to his journals). He took a motorcycle journey across S. America twice, the second not ending too well. 

He served some time in a Mexican jail (not sure what for) and met Fidel Castro, a Cuban who wanted to reclaim the government of his country from Fulgencio Batista and therefore from American capitalist influence. In the late 1950s, Castro, Guevara and something like 60-70 freedom fighters boarded a used yacht and set sail for Cuba from Central America. However, the Cubans knew about the plan and met them at the beach with force. As his comrades fell around him, Guevara said he had to choose between being a doctor and a soldier and chose the latter.

Creating two "columns" he and Castro marched across Cuba to Havana and took it, mainly due to having recruited so many Cubans along the way (they went from numbering a couple dozen to a few hundred) and executing those loyal to Batista. They set up the communist government which has been in place there ever since.

A couple of years later, Guevara went to the Congo to impart his knowledge of revolutionary tactics and principals, but found the people there to be lazy and not willing to fight to the end. So he left, lived in Europe for a bit, then wound up in Bolivia where he tried to repeat the whole thing and was killed by a CIA spook who claims to still have his iconic beret.