Running a homelab
What started as a used laptop is now a Homeserver. A homelab running K3s on top of Ubuntu Server. Rescuing hardware that was headed for a drawer turned out to be the cheapest way to get a real cluster to break, rebuild and learn from.
It is where I try things before they matter, and where I run my own cloud apps. The Discord bot behind the contact form on this very site is one of the workloads it hosts.