How And Where Do I Begin To Learn About Politics And Government?

I'm 15, currently reside in the UK and am writing an anime screenplay. One of the main themes of the screenplay is corruption within the Japanese government, but I always felt that something was missing. Now I realize what was missing, my knowledge of government a politics. I have been trying to learn the basics of these two subjects, but I just don't know where to begin. If you could post some suggestions about how and where I can begin learning about politics and government (preferably

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