start with the basics
The laws of physics have not changed. Here is a suggested reading list of older (and therefore cheaper) books.
1. Start with an amateur radio book. I suggest the 1968 4th edition of the RSGB Radio Communications Handbook. Read it through many times until you both mentally understand everything and also have a physical emotional feel for it.
2. Get the book Circuits, Devices, and Systems by Ralph Smith and do the same reading cycle. Do the homework problems. Get a free version of SPICE from the web and check your answers with it. Try varying the circuit parameters and see if the results are as you expect. The book on SPICE by Paul W. Tuinenga is very good for learning how to use the program.
3. At this point you should have a good understanding of the scientific principles and can branch out in your reading to areas that interest you. You should also have a good enough understand to be able to get a job in electroniccs doing technician level work.
This might seem a lot of work to do before you end up doing what you really want, but it is like practicing scales in music before you get around to playing popular tunes.