I write up a review for almost every book I read, to post to my Goodreads account. If somebody else profits from the review, great, but the main reason is that

I write up a review for almost every book I read, to post to my Goodreads account. If somebody else profits from the review, great, but the main reason is that it causes me to stop and reflect on what I read. Sometimes I go back and dip into the book again to clarify my thinking. Mostly, it's just a kind of exercise/reminder, after all is read, to turn that into a condensed bottom line summary. I think it's like doing homework after hearing a lecture; it helps to solidify the knowledge, by forcing your brain to grapple with the content.