Is buying a book for this necessary? How much investment in time does it take to become efficient at using memory techniques? I just need the ideal technique for rote-memorizing straight up facts like rules, formulas, trig ratios, periodic table of element (I don't need to memorize that though...). I am already using Anki to enhance my learning, but I think I could further and accelerate my progress and efficiency if I start incorporating memory techniques. I think I only need one, and I remember reading up on here about someone mentioning the peg system. Is the peg system all I need to know for rote-memorizing rules?