Explanation:

- Champaran Satyagraha: This was Gandhi's first active involvement in Indian freedom struggle in 1917. It was a farmer's uprising in Champaran, Bihar, against the oppressive plantation system.

- Kheda Satyagraha: This took place in 1918 in Kheda district of Gujarat. Farmers protested against the British government's decision to levy tax despite crop failure.

- Ahmedabad Satyagraha: Initiated by Gandhi in 1918, it was a struggle between mill owners and workers over the demand for better wages.

- Rowlatt Satyagraha: A nationwide protest against the Rowlatt Act in 1919, which allowed detention without trial.

- Civil Disobedience: A mass protest led by Gandhi in the 1930s against British rule, known for events like the Salt March.