Although I can generally remember the basic concepts of books that I've read, I have trouble retaining details.<p>What are your methods for retaining read information?
If I'm reading for pleasure, I don't bother. But when I'm reading for understanding or learning, I take time to take notes. By hand.<p>I've watched people read technical books quickly, reading as if they are novels. The net result is that they haven't internalised any of it, just gained an awareness.<p>Sometimes that's all you need to do, to become aware of things, but sometimes you need to engage the material in hand-to-hand combat.<p><pre><code> “Tell me and I forget,
teach me and I may remember,
involve me and I learn.”
― Benjamin Franklin
</code></pre>
Get involved.
Read a paragraph. Close the book. Write down what you remember. Re-read the paragraph and check.<p>Once you've got the hang of this expand it to pages and then chapters.<p>Get someone else to test you a short time (a few minutes) after you've read the chapter. Get them to test you a couple of hours later. Get them to test you a day later.<p>Teach the concepts to someone else.<p>Implement them - learn by doing.
I'll take a different stance than a lot of the other commenters here, in today's digital age reading for full retention is often over kill. An awareness of the topic, plus a retention of the source allows you to cover information at a much quicker pace and it useful if you don't need to apply any specific details in the immediate future. I find having a breadth of information available is much more useful for creatively solving problems and the internet + cloud storage means the full text is never far away if I need to pursue immediate details.
With nonfiction books details tend to stick better in my mind on their own (and even more so if I take notes, especially notes in a physical notebook with a nice pen - it's like my mind is more invested that way).<p>But when it comes to fiction, I can finish a book, wait a week or so, then read it again and only have a rough idea of the general plot in my mind. It's like all details are flushed within days. If it happened with nonfiction or other learning I'd work on strategies to improve this, but as it is I kind of think of it as a benefit! I get to experience my favorite books (and movies) afresh many many times and never get bored.
I forget who it was specifically but when listening to a podcast recently the guest mentioned a long term habit of writing a book report after finishing up a book! I plan to try something similar in a plain old composition notebook for 2016. I'm thinking no more than a page of text highlighting some important points, thoughts, etc.
Take notes.<p>I am always amazed how little people write during lectures, meeting and when reviewing documents.<p>Even easy concepts noted help create a chronological memory jog.
The second most important thing is taking notes (by hand). The most important thing is applying that knowledge, so doing exercises of various sorts.<p>You say you are having trouble retaining details, how fine grained are we talking about? Because you WILL forget some details, it's unavoidable.
If it's a mass of stats or something like that, I'll fire up a flash card program. If it's something more abstract, an important concept or the like, then I'll try to apply it to something - use it in a program, try to see what it implies in different contexts.
While reading, I take a photo of a sentence I like. Later, I look at the photo and write down the part I liked: writing seems to ingrain the conclusion in my mind.