Hacker News story: How do you memorize things you read?

How do you memorize things you read?
— especially if they're technical you don't use them regularly at work? For example, I don't work in finance (got the degree but my grades were abysmal), but I have a great deal of interest in the field, so I bought the CFA and CAIA curriculum. As I read it I grasp it and answer provided problems with no difficulty. But when I return to the material a few months later, I may as well re-read the whole thing for the amount of detail I've retained. 15 comments on Hacker News.
— especially if they're technical you don't use them regularly at work? For example, I don't work in finance (got the degree but my grades were abysmal), but I have a great deal of interest in the field, so I bought the CFA and CAIA curriculum. As I read it I grasp it and answer provided problems with no difficulty. But when I return to the material a few months later, I may as well re-read the whole thing for the amount of detail I've retained.