For some, just reading is enough to memorize; however, like many already said, the actual task of writing is by far the best way to memorize/remember. You are running two tasks instead of one: thinking/reading of the words coupled with actually writing it down.
I find that you concentrate more when you are writing. Whereas when you just read, your mind can sometimes slip away but still be reading (well, I do that sometimes, call it ADD all you want, but that's not what it is). I sometimes find myself at the end of a paragraph and not realize what was written at the beginning.
Of course, don't write down an entire chapter of a book. Take some of the core subjects that you are unfamiliar with and start finding excerpts that help explain the subject, then start writing it down. That's really the basis of notecards, but you don't necessarily need notecards. A notebook will do just fine, of course. Notecards are just very handy when you need them later on.
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