I was indirectly exposed to and using Kubernetes at work, but I didn't know what it was, so I searched to get a qualification and came across this lecture. I studied intensively for about two months, and Mr. Cho Hoon's lecture was a great help in understanding the concepts, so I was able to pass the CKA easily. Don't struggle alone, but listen to it once and you will feel like you can do it too. Fighting to everyone.