I can't able to understand process model completely what can i do?
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Here is a couple of process modeling courses from Appian academy.
academy.appian.com/academy.appian.com/https://academy.appian.com/#/online-courses/278aded9-db23-4a78-84a9-74d0b550d05b
Here is the documentation for process modeling.
https://docs.appian.com/suite/help/21.1/Process_Modeling_Tutorial.html
Hope these resources will be helpful for you.
good suggestions!