Comment by skew-aberration

> It's mostly about reading datasheets, and connecting pins to each other IOC those datasheets .. Maybe the physics and mathematics are more important for analog electronics or designing ASICS?

I agree that electronics is very accessible, and I'll add that in my experience as an EEE the main beginner gotcha is bad PCB layout rather than maths/physics.

For a flight controller say, bad layout would manifest as slightly noisier sensor readings and reduced radio range. But assuming this is 4 layers https://www.anyleaf.org/mercury-g4 then you probably know what you're doing :) - ditto for OP's article.

Simple layout rules will take anyone 99% percent of the way to professional results. Ground planes on inside (or bottom) layers, signals on outside (or top). Don't cut ground planes. Decoupling caps close to ICs. Keep current loops small. Vertical traces on one side, horizontal on the other. A single youtube video could teach you all that.

When I used to do this stuff for a job, math/physics was only needed for analog electronics (interfacing to hardware like specialized/novel sensors), optimizing control systems and signal processing, and general cost/efficiency engineering - but you could go a long way without it.