can you guide me Appian RPA documentation or course material ? is there any RPA certification available ?
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I'd suggest looking at Appian Academy Online - there is a course on Appian RPA 101: Learn to Create Bots which should help you get started.
You can also check out this page on Community - https://community.appian.com/p/rpa that provides information on the various resources available to help you learn about Appian RPA.