What random ideas from courses have been valuable?

In another thread,

writes:

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I've taken courses that I didn't finish. But the amount of studying I did do, combined with related unfinished courses, and my own work and life experiences has all added up to this cumulative knowledge and insight I simply would not have without my messy inclinations and unfinished courses.

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In that thread, I had an example of a course I didn't finish or implement when I got it, but which still gave me an idea that ended up being useful to me years later.

This got me wondering, have you had experiences like that? I mean, have you ever found...

A valuable idea or tactic or strategy that you got from a course that you never never finished?

Or an idea or tactic or strategy that you got from a course, which you didn't use at the time, but which you used and profited from years later?

Or a a tangential idea that somebody dropped in a course or training, which you ended up using, even though it was almost irrelevant to the main thing being taught?

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What random ideas from courses have been valuable?