I am still no expert in the area of Kubernetes. So I came across an blog series of VMware about “12 Days of Kubernetes”.
https://blogs.vmware.com/vexpert/2021/12/19/12-days-of-kubernetes/
I haven't gone through everything yet, but I plan to. It consists of posts, videos and courses. One piece per day. Honestly it seems to be very VMware Tanzu centric. Maybe it is interesting for others too.