How to pair mini PC with streaming services to stream on dumb TV?

Basically title. How does one go about pairing third party services like streaming services to a mini PC so that you can stream it on your dumb / degoogled TV? I don't really know how TVs work, much less mini PCs, so if anybody could dumb it down for me I'd appreciate it. What does your setup look like, if you have a dumb TV (e.g running kodiTV without network connection)?