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A research paper called "Improving Students’ Learning With Effective Learning Techniques: Promising Directions From Cognitive and Educational Psychology," which is backed up by experimental studies, can serve as a great introduction to develop a learning strategy [0].

The summary is that doing practice tests (e.g. creating flashcards in a question-and-answer format, or regularly doing practice problems) is highly effective, along with studying over a longer period of time instead of cramming. Switching between learning subjects ("interleaved practice") is also effective, along with creating explanations in your own words about a text, together with asking yourself questions about the text. In contrast, highlighting the text and rereading as a way to learn is relatively ineffective.

[0] Full text [PDF]: https://pcl.sitehost.iu.edu/rgoldsto/courses/dunloskyimprovi...