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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 (CKA) track, as you will learn end-to-end Kubernetes architecture and operations.
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Okay, I understood that you are a developer and you are not going to manage the Kubernetes infrastructure or cluster but just deploy and manage your application. Well, then you go for Certified Kubernetes Application Developer (CKAD) track, as it will just cover what you need to deploy and manage applications in a Kubernetes cluster.
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If you are from the Security track and handling all security-related operations, then the Certified Kubernetes Security Specialist (CKS) 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.
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Since the tracks and topics are “tightly coupled” or almost the same, it would be great to get multiple certifications (eg: CKA + CKAD or CKA + CKS etc) as it won’t take much effort to get the second one. Yes, only if you are interested and okay to spend money on that; my opinion only.
This is the foundational exam to understand and validate your core knowledge in Kubernetes. This is not a mandatory exam but if you are a person who needs to know Kubernetes and validate the knowledge then you can get this certification rather than going for advanced certifications such as CKA, CKAD or CKS.
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Also, see CKS – Challenges by Kodekloud – This series consists of a set of complex challenges that will assist you in mastering Kubernetes Security concepts and getting ready for the coveted Certified Kubernetes Security Specialist Certification.
Just want to learn Kubernetes as beginner ? Check this Kubernetes for the Absolute Beginners (With Hands-on) from KodeKloud.
kubectl
cheatsheetBelow 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 documentation, or 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.