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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

Vintage computing, while rewarding, can be hazardous; not only do you have to deal with leaky batteries and the occasional exploding tantalum capacitor, but mice and rats often make a real mess of things and especially in the American Southwest, this carries the risk of hantavirus

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

Speaking of tubes, it’s worth learning some of the military and related part number equivalents for popular tubes; a lot of better and more durable versions of, say, the 12AT7 are out there for a fraction of the price because they don’t have “12AT7” stamped on them and the audiophiles aren’t looking

Learning what to read in datasheets is an art and takes practice. Op amps are especially tricky, because we like to treat them as ideal devices, but even nominally similar ones (e.g. the TL072 vs the 5532) can have huge differences in bandwidth, input impedance at different frequencies, etc.

Speaking of op amps, there are not nearly enough fully differential ones available, someone get on that please