I love playing around with back end tech. Currently am running a bunch of different systems to get a feel for all the different aspects of technology. So i have a mac mini, a linux mini pc, a big 4 drive NAS from Synology and a little two drive NAS from Terramaster (with Truenas installed to tinker with). I also have an older PC dedicated to running a little lab environment so I can spin up things like a docker swarm or k3s cluster to try things out.
Currently I am mostly exploring docker and all the applications and services it provides. I am learning to roll my own Docker compose files and building stacks up from scratch just see what it can do and give me interesting services to play with. Also learning about Docker Swarm and how it clusters and balances things.
I have also been exploring the Proxmox hypervisor system and seeing what works in an LXC and what works better as a full VM.
As a result of all this I have a bunch of services running like Dashboard, Caddy, Gitea, Gotify, Jellyfin, Home Assistant and PiHole. I also am also watching a lot of the Self Hosted and homelab content on Youtube for any of the new shiny toys to look at.