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With GQRX and Pi 4 I've been able to learn a lot about signals on the FM and L bands, including sideband analysis on FM, analysis of my car remote signal (it has FSK modulation), characteristics of trunked radio, FFT analysis, and other concepts. It's a great setup for starting to understand the part of the spectrum that the RTL-SDR pulls in. The negatives are that the Pi heats up and shuts down quickly with GQRX and that decoding software such as CubicSDR, Unitrunker, and WxtoImg are either not compatible with the Pi or the process for downloading and opening them is not straightforward. I'm still interested in finding more SDR-related software that I can use with the Pi.