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Let’s do this, one like (subject to an unstated maximum), one electrical/RF engineering opinion

More people should build stuff with vacuum tubes. They’re easier to understand on a conceptual level than semiconductors, and it’s absolutely worth learning the limitations of things from the past at a fundamental level, plus there are still millions of them in circulation

It’s always a good time to learn about spiral antennas

Similarly, it was much easier to get my ham license than I thought it was, more people should do it! But be careful about sharing your call sign unless you’ve registered with a PO Box, because the FCC database is fully public, including your address and phone number

Microwaves are, surprisingly, where electrical engineering starts getting a bit easier to understand, because that’s the scale where wires start behaving a lot more like plumbing than magic

If you want a really good crash course in analog engineering, start building analog synthesizer parts; you will gain a much more visceral understanding of how transistors really work by making a log converter (for 1V/octave) with a BJT than any amount of book exercises

Beyond that, it’s definitely cheaper to build bits for Eurorack than buy them, though I really wish there were more standard-ish prototyping parts like panels and breadboards out there

Also, this is not an opinion so much as a fact that is not communicated very well in basic electrical engineering books and courses, but: BJTs are voltage-controlled, not current-controlled, and (here’s the opinion part) teaching them initially as current-controlled does a lot of lasting damage

Cheaper if you already are committed to putting in the time to learn circuit design in both theory and practice, I presume.