Besides spaced repetition, Active Recall, also known as Active Learning and Retrieval Practice, is the other powerful learning technique.

Active recall is where you try to recall information from memory without looking at your notes or textbooks. 

The effort to actively recall information solely from memory to answer questions builds neural pathways to better remembering that information. This makes it easier to retrieve that information in the future, like in a test, because you will have retained it in memory by then. 

By incorporating active recall into your learning routine, you can enhance your learning and improve your learning by focusing on actively engaging learning new material.

Moreover, active recall can help you identify gaps in your knowledge. You can then target these gaps for further active recall practice to improve your understanding and recall of them.

There are 3 ways you can do active recall: 1) summarizing material to oneself, 2) teaching others and 3) answering practice questions or exercises.

See the attached video for full details.