deploy-nginx-exposed.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment # k8s deployment creates pods (instances of containers) and ensures the spec mentioned below is maintained (declarative)
spec:
  selector:
    matchLabels:
      app: nginx-app # container name - used for ensure replica count is always maintained
  replicas: 1 # no of pods to run
  template:
    metadata:
      labels:
        app: nginx-app # container name
    spec:
      containers:
        - name: nginx-app # container name
          image: my-nginx-image # docker image name. Have this build already
          imagePullPolicy: Never # Don't pull from remote docker registry during local testing
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service # a service exposes deployments/pods to other microservices in our cluster/external traffic
spec:
  selector:
    app: nginx-app # container name
  ports:
    - name: http
      port: 80
      targetPort: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: minimal-ingress

spec:
  ingressClassName: nginx
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: nginx-service
                port:
                  number: 80

Ensure your ingress-nginx is running. If you are using docker-desktop, then run the below command.
Reference

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.8.0/deploy/static/provider/cloud/deploy.yaml

ingress-nginx-admission-patch CrashLoopBackOff error

• Reset your k8s instance & restart your docker desktop and try.

Apply changes
kubectl apply-f nginx-deploy.yml

• Suitable for 1st usage
• Worked inconsistently for me. Maybe it failed due to high CPU usage. Started working fine later.
• Reference1, Reference2

Subsequent changes
kubectl replace -f nginx-deploy.yml

To delete the resources created from the file
kubectl delete -f nginx-deploy.yml

As per ChatGPT
apply -> Create/update (preserves metadata/fields)
replace -> Update -> Replaces existing resource with a new one