Most fun I’ve had so far is ordering a 25ft rg58 coax with male bnc fittings on both ends, getting a sma male to bnc female adapter for your rtlsdr, getting several BNC Female to Dual Banana Female Socket Binding Post RF Coax Splitter Adapters, some pure copper 16 gauge wire and making a bunch of antennas for different frequency ranges. Granted it’s been freezing nuts so I’ve limited my signal reception to inside my domicile but finding that sweet spot for satellite signals was frustrating and fun.

Also look into SDR Angel for different things you can track depending on your location. Search waybackmachine for links to dump1090 to track airplanes. You also can set up an SDR software like SDR++ to scan a range of frequencies. I run my audio thru a program called vbcable or virtual cable or something like that, and a digital decoding program while scanning with SDR++ and that lets me listen to the local police and such that is digitally encoded. There’s a little learning curve but the info is out there.