If you are interested in Kubernetes, containers, and want an actual multi-node cluster you can use for learning, it is kind of fun to build your own by using Raspberry Pi devices and a few extra bits of hardware.
Join Rockford Lhotka as he talks about how he assembled a four node cluster, got 64 bit Ubuntu set up, and installed Kubernetes with microk8s, all for less than the cost of a low-end laptop.