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Pick some unrelated lectures, they said.
(sh.itjust.works)
It will widen your horizon, they said. And here I was, foolishly thinking I could get away with half-assing statistics during my degree.
Oh you can get through most degrees without properly learning linear algebra or statistics.
But those 3 are the knowledge that will pop here and there on everything you do, and leave you confused, incapable of understand things, and incapable of extending things if you don't know them. Usually, you won't even have to calculate anything, you just have to know them.