If you found this interesting but didn't fully get some of the things explained, I can recommend checking out W2AEW's video where he explains things on paper and illustrates them on the bench in under 12 minutes. https://www.youtube.com/watch?v=81C4IfONt3o
Alan Wolke (W2AEW) is a prominent YouTuber making videos on electronics, ham radio, and related topics. He is a long tenured Tektronix employee and an outstanding technical educator.