Kubernetes website has a cool browser-based collection of exercises to get you started. Great materials to work through. Do those, see that k8s isnt that scary to run commands against. Find a buddy to work through them with and quiz each other to check for comprehension.
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CKAD
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Cloud Native Foundation Training
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Security Best Practices
Conferences:
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Ibotta K8s: Intro to Orchestration - sry not public