In the previous lecture, I said - "When a pod is created the containers are assigned a default CPU request of .5 and memory of 256Mi". For the POD to pick up those defaults you must have first set those as default values for request and limit by creating a LimitRange in that namespace.

apiVersion: v1
kind: LimitRange
metadata:
  name: mem-limit-range
spec:
  limits:
  - default:
      memory: 512Mi
    defaultRequest:
      memory: 256Mi
    type: Container

https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/memory-default-namespace/

apiVersion: v1
kind: LimitRange
metadata:
  name: cpu-limit-range
spec:
  limits:
  - default:
      cpu: 1
    defaultRequest:
      cpu: 0.5
    type: Container

https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/cpu-default-namespace/

References:

https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource