I presume you want the basics. If I may let me suggest going to a library and/or a book store. If there is a "Radio theory for Idiots" in print that would be a good start.
I have an AAS in Radio Engineering Technology but I became an expert on vacuum tubes just in time for them to be tyrashed for solid state devices.
IIRC the SWC did and may still offer SF Communications Extension courses. These courses are great and you also end up with a great personal reference library.
I completed every course they had by disciplining myself to complete one lesson per night.
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