There is a youtuber junior md called Ali Abdaal. He has very good scientific videos about learning. Talks about subjects such as “active recall” and “spaced repetition”. Worth a look imho.
Should you be interested in the science and research behind it, I warmly recommend reading the book "Make It Stick" where the concepts are discussed in length. [1]
[1]: https://www.goodreads.com/book/show/18770267-make-it-stick