As for guides. It's a pretty big community so just use the keywords from above [RTL-SDR, ADSB, DUMP1090] and you should get a lot of guides on tracking aircraft.
This is a popular and up-to-date fork: https://github.com/flightaware/dump1090
Whens someone asks for a glass of water, do you also drive them to the mountains and point at the rain clouds?
I use a raspberry pi, a couple cheap USB radio receivers, and use it with my tablet to show the weather and nearby traffic in the air. On android, you can link the flight data via wifi (from the pi) to a tablet running Avare (https://play.google.com/store/apps/details?id=com.ds.avare&h...) or some of the other flight tools on a moving map. Super helpful, as when flight following says there is someone somewhere, you stand a chance of being able to find them faster. It also pulls weather information in the air... which with moving map near real time is fantastic.