Many folks in the community have contributed their own installation guides for various platforms. You can find some of them below. If you created a guide and want it listed here, please let us know!
If you'd like a simple step-by-step guide, written by a UniFi Poller user for implementation on Docker on a Raspberry Pi then have a look at this nerdygeek guide!
Note that a Pi is not recommended for use in a long term context - although many users have started this way, the amount and type of data collection is better done on a more capable server.
Here's another RPi guide (in video form) from MacTelecom: https://www.youtube.com/watch?v=OaKcQUb2gYc