difference between script task and user input task? And why we use? And when we use?
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Did you attend the Appian academy? I think this is covered.
https://docs.appian.com/suite/help/21.2/Configuring_the_Script_Task.html
docs.appian.com/.../Configuring_the_User_Input_Task.html
Agreed, I'd also highly recommend the Academy Online training courses. These courses provide answers to all the questions you have asked: community.appian.com/.../courses