I maintain a comprehensively documented ‘homelab’ which I use to play with enterprise-grade and industry-standard hardware & software. I use it to learn networking/administration fundamentals and experiment with new technologies/applications in an environment where it doesn’t matter so much if things aren’t perfect.
It hosts many services and applications for friends, family and my own personal use, such as Plex, Guacamole, GitLab, Node-RED and more.
You can find more info about my setup within my knowledgebase on Notion; I am quite proud of how organised I have everything here.
If you would like to learn more about being your own sysadmin, the r/homelab subreddit has some excellent resources.