[John Bartley]

Back in the 1950's (roughly), the U.S. armed forces produced a set of hard cover training books, a set of three in one cover, titled, "Basic Electricity, Basic Electronics, Basic Radio" There are others that are also good, but this set, authored by (as I recall) VanValkenburgh sp? is the absolute best I have ever seen for learning on your own. It's probably my most read, most used for reference book set. I tink it's available on line for free if you search.

That book was what taught me almost everything I learned about theory.

Have a look : https://archive.org/details/BasicElectro...umes151955

https://archive.org/search.php?query=cre...Neville%22