2001: A Space Odyssey
Just epic classical music.
Spirited Away
Joe Hisaishi fits the fantastical setting perfectly. Lots of bittersweet, exciting, and meditative moods, each placed in the perfect scene.
Tarantino’s movies usually have a great song selection.
Full Metal Jacket
Hearing “Bird is the Word” juxtaposed with the Vietnam War is just a crazy choice that paid off.
Nobody (2021)
Turned me on to Luther Allison. Not a “best soundtrack” but it definitely stands out.
There are plenty of good resources online. Here are some topics you probably wouldn’t see in an intro algos course (which I’ve actually used in my career). And I highly recommend finding the motivation for each of these in application rather than just learning them abstractly.