>>75430 (OP)it depends on what type of subjects you're learning but im guessing you're asking about the most important lucrative but hard subjects which is STEM.
The two best soyentific methods are active recall and spaced repetition.
So active recall just means practice, not just passively read or summarize or watch lectures. But to ur homework, assignments and practice tests to the best of ur abilities so ur forced to pull information from ur brain which is the best way to learn. Practice assignments,homework and practice/mock tests for math, but for conceptual stuff u need to memorize like biology, use flashcards
Spaced repetition just means practice regularly and never stop practicing it over a period of time so u dont forget it. Forgetting is an underestimated but potent enemy of learning