Yes, I absolutely recommend this! Writing about what I learned was a course requirement at college last year, and I was... extremely thorough, but it worked so well. It solidified what I'd learned, helped me identify areas of improvement, and allowed me to make connections and ask questions that wouldn't have occurred to me if I hadn't been writing about what I'd learned during each week. I also found that writing about things I'd researched helped me analyse them much more effectively.
My teachers were less thrilled when, for the final module, I handed in a 240 page, handwritten, annotated book containing approximately 70k words for assessment. Got the highest possible grade (A+ equivalent) though, so I guess they didn't mind that much. π