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> maybe even more so than Mac Lane’s Categories for the Working Mathematician (which I sometimes see suggested […])

FWIW, I am very against this recommendation. That book is needlessly opaque. I don’t know a good recommendation for category theory, but that isn’t it.

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David Spivak (no relation to Calculus Spivak) wrote a book called _Category Theory for the Sciences_ that could totally serve as the basis for a one-semester undergrad course with some work.

He really likes working in informal categories (like his “ologs”) but I haven’t taught from it yet so I’m not sure if it is more or less confusing to introduce categories that way.

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