The good study hack I have come across the yields deterministic results is the use of space repetition for memorising items. It's is way more effective than middles practice routine practise/revision.
I think the only others I know is about the best way to learn a new programming language/technology or technology.
Which is stay away from videos, restrict yourself to written content. And build something you you find interesting. I heard it also works for learning a real language (you want to learn Spanish, date a native Spanish speaker and try to exclusively communicate with them in Spanish, it's also how kids learn new languages). It's way more effective than sitting in a Spanish class our using some app.
What other study hacks do you know of that outperform traditional methods of study or teaching?
Haptics vest for gaming bit easier to aquire. -- aka feel the sound
[1] : https://scitechdaily.com/mits-wearable-ultrasound-sticker-mo...
I think this is very individual-dependent.
E.g. only recently I've realized that I absorb audio content much better than text (or video, for that matter). So the "hack" for me is to try to get the content in audio form.
Feynman also talks about this in one of his books - whatever the Education researchers say, some people are more visual, some more aural, and maybe there are other ways as well.