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Okay, I am not an expert to advise you to choose your track as we all know Kubernetes have three tracks and you need to decide which one you want to go.
If you are an Infra guy like Linux Engineer or Systems Engineer, then you can go for Certified Kubernetes Administrator track, as you will learn end-to-end kubernetes architecture and operations.
Okay, I understood that you are a developer and you are not going to mange the kubernetes infrastructure or cluster but just deploying and managing your application. Well, then you go for Certified Kubernetes Application Developer track, as it will just cover what you need to deploy and manage application in a Kubernetes cluster.
If you are from the Security track and handling all security related operations, then Certified Kubernetes Security Specialist exam is the one you have to choose. You will be assessed for security hardening, cluster hardening, vulnerability management and other logging/monitoring related topics.
Since the tracks and topics are “tightly coupled” or almost same, it would be great to get both certifications as it wont take much effort to get the second one. Yes, only if you are interested and okay to spend money for that; my opinion only.
Just want to learn Kubernetes as beginner ? Check this Kubernetes for the Absolute Beginners (With Hands-on) from KodeKloud.
Below are some of the free (most of them) resources to learn Kubernetes from scratch. Some of them will talk in detail about Kubernetes concepts but some will explain using practical sessions.
You will not be able to learn Kubernetes by just reading the documentations, watching videos or course materials. You need to practice as much as possible using available labs or your own lab arrangements. Below are some of the lab resources you can refer to practice.