My new (not really new but i used to use virtual machines) but expensive hobby I've gained is to homelab. If you do not know what homelabbing is, please watch this video.
https://www.youtube.com/watch?v=gPGf4Y8nQqM
In short, Homelabbing is basically self-hosting servers/devices on your own network. The video describes it better than me.
However, after as I started to make more money I started to invest more money into my career and self hosting physical devices on my network.
Here is a picture of my homelab.
Here is what is running:
Ubiquiti Dream Router
Ubiqiuiti Cable Modem
Ubiqiuiti Switch Lite (8 Ports 4 PoE)
Cisco 250 Business Switch
Asustor NAS (Jellyfin + NFS)
Raspberry Pi 4 4GB Running OpenVPN + Pi-Hole (DNS)
Raspberry Pi 4 2GB Running a Web Server
3x Raspberry Pi 4 8GB in a Kubernetes Cluster (Prometheus + Grafana and other container in the future)
a GMKTek Mini PC (Project Zomboid Server)