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 low-cost devices such as Raspberry Pi and old laptops, plus a few extra bits of hardware.
Join Rockford Lhotka as he talks about how he assembled a multi-node cluster, got 64 bit Ubuntu set up, and installed Kubernetes with microk8s, all for less than the cost of a low-end laptop.