Which movement did Gandhi Ji initiate as a result of Jallianwala Bagh incident?

Gandhiji initiated Rowlatt Satyagraha in 1919. There was widespread national protest agitation against the Rowlatt Act. It was mainly confined to the cities. Gandhi wanted this movement to be non-violent. To read more about the Rowlatt Act, check the linked article. 

Read more:

• Non Cooperation Movement
• Salt Satyagraha – History, Facts & Cause Of Salt March