[she11c0de]

You may find Michael Ossmann's SDR course [1] helpful - it builds the knowledge from the groud up and uses GRC for implementation.

[1] https://greatscottgadgets.com/sdr/

[superkuh]

Unfortunately that's a guide for older GNU Radio versions. It will give new users quite a bit of trouble at this point with all the namespace changes since 3.6. But back in 2015 it was a great way to learn.

[marcusmueller]

I quite like Marc Lichtmann's (who happens to be on the GNU Radio board) https://pysdr.org quite refreshing and good for beginners.