Brand New - In over my head

I just recently setup a Kubernetes cluster on Proxmox using this. I've never used docker, kubernetes, etc so now I'm kind of lost. I have VMs & LXCs running the typical things you see in a homelab.

How do I go about deploying those in the kubernetes cluster? I've been looking through public repositories and I've tried bruteforcing my way into a deployment with copy & paste, but a lot of the values are secret, or something not related to my cluster so I'd like to learn more about what each setting/value actually means and can be changed to.

Any advice for where to learn more would be greatly appreciated.