What do you actually do: Look at the spec sheet and copy the example circuit.
It is surprising and confusing how good people get at electronics without persay being very mathemtical about it. Some of it is pattern recognition
Circuits are not functions. They are relations The delusion of perfect sources
The golden rule.
555 Timer chips
Node and mesh
Laplace transform. Because we care about impulse response
Models of antenna
Circuits aren’t the circuits you think they are. Shit gets messy
SDR Complex signals smith charts
Debugging / Measuring
Multimeter Oscilloscope scope tutorial
Discrete Chips 7400
https://en.wikipedia.org/wiki/List_of_7400-series_integrated_circuits A little bit this kind of thing is just for fun. You can get insanely powerful micorcontrollers for cheap. You could argue maybe for simplicity or speed or parallelism. Serial latch
Art of electronics - didn’t really like this one. ARRL handbook is really good actually https://www.youtube.com/@w2aew