My 101 of analog electronics, in the recommended order of reading:

What is electricity - https://lcamtuf.substack.com/p/but-good-sir-what-is-electricity

Setting up a workshop - https://lcamtuf.substack.com/p/setting-up-an-electronics-workshop

Core concepts in electronics - https://lcamtuf.substack.com/p/primer-core-concepts-in-electronic

Core concepts 2: complex impedance - https://lcamtuf.substack.com/p/impedance-part-2-why-do-lcr-meters

The physics of semiconductors - https://lcamtuf.substack.com/p/how-do-transistors-work-anyway

Signal amplification, from transistors to op-amps - https://lcamtuf.substack.com/p/the-basics-of-signal-amplification

RC circuits and analog signal filtering - https://lcamtuf.substack.com/p/the-101-of-analog-signal-filtering

Signal filtering 2: transfer functions, Sallen-Key - https://lcamtuf.substack.com/p/analog-filters-part-2-let-it-ring

Signal reflections - https://lcamtuf.substack.com/p/signal-reflections-in-electronic

The skinny on radio theory - https://lcamtuf.substack.com/p/radios-how-do-they-work