To complement the video, I authored a two-page summary document describing the magic numbers approach. I tried my hardest to make it as readable / accessible as possible. It can be downloaded by clicking this link.
The magic number video and cheat sheat reference storing passwords in tables, which could be achieved by using a word processor or spreadsheet. Clicking on the aforementioned links enables you to download blank "password register documents".
The video below is my attempt at giving pragmatic advice around password management. It's aimed primarily at the elderly and unskilled, utilising an approach which I've called "magic numbers". I made the video and corresponding document to keep myself busy during the covid-19 lockdown in 2020. You can also view it on YouTube directly via this link.