I have written several tutorials about this on my Steemit profile, inlcuidng a whole tutorial to create a brain wallet for BitCoin. Scroll down on my page to find them. If you have any further questions just ask. And yes, I memorize all my passwords.
There is also a book from a friend of mine which just came out: https://www.amazon.com/Hack-Proof-Password-System-Depth-Remembering-ebook/dp/B071KMT446/