How Do You Tell If the .yaml File for a kubectl Command Will Work?

Problem scenario
You want to do some pre-testing on the .yaml file(s) you will use with kubectl. How do you validate a .yaml file has correct syntax for Kubernetes?

Possible Solution #1
Try this command:
kubectl apply --validate=true --dry-run=true --filename=nameofyourfile.yaml

Possible Solution #2
Try this website:

Possible Solution #3
Try kubeval:

Possible Solution #4
Use Copper:

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