Which Flow Checker warnings matter?

Theo opens Flow Checker on his renewal flow. It surfaces three findings:

Flow Checker output panel with three findings - (1) "Action Send an email has no error handling", (2) "Trigger condition references an undefined variable", (3) "Apply to Each is configured with default concurrency"

Which findings should Theo fix before shipping?

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<cours>Intermediate Power Automate</cours>

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