First, there is this great video from Cameron Winters.
The Basics of Live Performance software
Next, there is an awesome series by Marty Wade.
Gig Performer Beginner Guide PT1 : HARDWARE and SETUP
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Gig Performer Beginners Guide PT2 : THE WIRING VIEW
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Gig Performer Beginners Guide PT3 : THE PANELS VIEW
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Gig Performer Beginners Guide: How to Create Layers / Splits