[quaddo]

When I was about 30 and wanted to scratch the same itch, I found an introductory electronics course being run at my local community college. From distant memory, it definitely covered off resistors, capacitors, coils, Ohm's Law, then worked its way to transistors and I think op amps. Somewhere along the way we got into the basics of creating logic gates, which also served to fill a void I had in my understanding of computers.

At a much younger age, I was interested in amateur radio. As luck would have it, I learned of a night school course being held at one of the local high schools that was meant to teach you everything you needed to know to get your license. The instructor (late 20s, if I had to guess) really knew his stuff. I think this gave me a far better grasp of the relevant electromagnetic and electronics theory and practice than I feel is made available through present-day amateur radio "memorize the answers and some context around them" teaching materials. My point is, if you want to stretch your understanding of electronics, it's possible a local ham might be another good option to consider.