Key Takeaways
Recollection
Spend 30-60 seconds after absorbing material to really digest it and see how much you can recollect without referring to source. Then repeat this process every day to see what you can remember.
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Re-iteration
Try to teach someone the material or write it down (use analogies or acronyms to chunk the information)
Simplify
Get rid of convoluted language, and attempt to ELI5