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What are sync waves in ArgoCD? What are resource hooks in ArgoCD? Which resource types are commonly used as hooks? How do you annotate a resource with a sync wave? What are the hook deletion policy options? What resource kinds make good hooks and why Jobs specifically? What is the Sync phase (as opposed to PreSync/PostSync)? What are the hook phases and when does each run? How do sync waves and hooks interact? What are hook deletion policies?
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What is the default sync wave and how are negative waves used?

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Answer

The default wave is 0 when no annotation is set. Negative waves run before wave 0, which is handy for prerequisites like CRDs, namespaces, or operators that must exist before everything else. Ordering runs from the lowest (most negative) to the highest wave.
metadata:
  annotations:
    argocd.argoproj.io/sync-wave: "-1"   # CRDs before workloads
Real-world example CRDs are annotated wave -1 so they install before any custom resources in the default wave 0.

Common follow-ups: Why put CRDs in a negative wave? | What order do waves run in?

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