Let's see...
The receiving end is tuned to particular frequency, then the IF section of particular bandwidth is used to mixed with incoming frequency, this separates the carrier wave, leaving only the audio section in the case of audio radios. Same thing happen with Television except there are multiple IF sections for the vertical, horizontal, and audio. Now with digital signals is the same to a point then things changes. It become similar to receiving two CW frequencies on the same carrier wave. With digital format the amount info that can be pack in the same bandwidth can be much greater. Otherwords a lot much more info can be sent in a much tighter bandwidth thus creating much better use of assigned spectrum width. Even with CW we can tighten up the IF section to a much better bandwidth to reject more noise to make the receive able to reject signals outside the desired one. This is why I have a 100hz bandwidth receiver for CW instead of the standard 500 hz version and even my old CB has a 3000 hz bandwidth IF section instead of the wider one. Now this does tuning a lot more sensitive to frequency shifts but I learned to deal with it.
And there multiple ways to modulate the signals too. Some of which are AM, FM, CW, and PW and those carriers can carry at least two information channels. An example is SSB. With AM there is a lower and upper single side bands which allow us the be one SSB while another party is on the other and no interference except when there a full AM signal which screws both sub bands because it has both.
General Class licensed. I do need to go far the Extra class since they dropped the 20 wpm CW requirement. But I am happy with bandwidth I have now.