For live training, I can not recommend Guru Labs[0] highly enough. They offer many courses, but specific to your question, lots of container related courses[1][2][3][4].

[0] https://www.gurulabs.com/linux-training/courses/

[1] https://www.gurulabs.com/linux-training/courses/GL340/

[2] https://www.gurulabs.com/linux-training/courses/GL360/

[3] https://www.gurulabs.com/linux-training/courses/GL355/

[4] https://www.gurulabs.com/linux-training/courses/GL390/

For K8s:

1. Read the book "Kubernetes up and Running"

2. After that you can start reading the https://kubernetes.io documentation

3. Alongside the documentation reading, practise what you have learnt using minikube.

4. Only after, start with Helm (which is pretty bad, but if your company is using it...)

I learned a lot of the concepts just by typing search terms into YouTube. “TechWorld with Nana” is one channel that comes up a lot and has good, digestible explanations.

Hussein Nasser too, but he has less content directly about Docker/k8s and more about networking. It's excellent though.

I work on the EKS team at Amazon and will recommend our YouTube channel “Containers from the couch” cftc.info and eksworkshop.com