Good way to start with K8S

I‘m trying to setup a k8s-Cluster for a couple of months and I‘m failing everytime (with different problems). Main goal for me is to extend my knowledge about k8s and as a final result deploy some applications (self-made and others) in an high availability mode. My setup includes two Proxmox-Nodes (hopefully 3 in the future) powered by tiny-desks (both HP) and an external QNAP-NAS all in the same VLAN. The network connection itself seems to work, but I‘m having trouble setting applications (especially ArgoCD).

The k8s cluster should be capable of:

• an external LoadBalancer as an EntryPoint (had already some test with HAProxy but open for other/better solutions)
• at least 3 controllers
• and a CI/CD pipeline preferable with ArgoCD to deploy some services automatically (- as an add on it would by nice to have everything setup with self signed certificates)

Has anyone good learning material or maybe a course to start with setting up such a Cluster? I tried already some things and read the documentation but it feels like a little bit to much for me to start from scratch.

Thankful for any recommendations!