There was an important role of Bhagat Singh in independence because he lost his life for the country till the end of his life he fought for his country and it is the biggest role very any citizen of a country for dying for their country.
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what did he do actually? before he lost his life?

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Bhagat Singh had fought for Indian freedom and independence as a revolutionary. through violent means, as opposed to Gandhi. He was involved in killing of a  police officer. He threw bombs inside the central legislative assembly in protest of the acts and ordinances being passed and enforced, against Indian citizen's interests.
He was tried and hanged later.