I really liked The Theoretical Minimum lectures on classical and quantum mechanics by Leonard Susskind (suggestion: google up the guy, he’s cool) at Stanford. You can buy books, but the lectures are all free on YouTube.

Classical mechanics playlist can be found here https://youtube.com/playlist?list=PL47F408D36D4CF129 and then there’s quantum mechanics available too, should be easily discoverable. And also there’s just https://theoreticalminimum.com/

Not sure if they qualify to be a “true” uni course though, because in this case nobody’s gonna give you assignments and grades :)