Core Folders in Kubebuilder

Folder Purpose
cmd/ Contains the entry point (main.go) of the operator, where the Controller Manager is started.
controllers/ Contains the controller logic (i.e., the Reconcile() function).
api/ Defines Custom Resource Definitions (CRDs) and their Go struct representations.
config/ Contains Kustomize configurations for deploying the controller.
hack/ Scripts and tools (e.g., code generation tools, local testing).
internal/ (Not created by default) Can be used for business logic services and helper functions.
pkg/ (Optional) Can contain shared utilities.