Civil Disobedience: The active refusal to obey certain laws, demands, or commands of a government without resorting to physical violence - like refusing to do homework as a protest against too much workload.
Salt March (1930): A nonviolent protest led by Gandhi against the British salt tax in colonial India. It's like walking all the way from your home to school just because you're not allowed to bring your own lunch.
Satyagraha: A policy of passive political resistance advocated by Mahatma Gandhi against British rule in India - similar to sitting quietly in class even when you disagree with what is being taught until the teacher acknowledges your point of view.