The theme is the main subject that you are going to write about in a essay or in a report. If you want to know more, just ask :)
Answer:
He entered politics by joining Praja Parisad, the first political party of Nepal. He was handed life imprisonment by Ranas for waging revolution against their autocratic rule.
Answer:
It most likely means a reminder that your past is still there and will not ever be truly gone
