2. Drain out unnecessary memories
Taking a photo or saving a file digitally can flush out the information out of consciousness. When you know that the information is already saved up in a file somewhere, you take it for granted that you don’t need to remember it and you can always take a look at it from the saved file whenever you will need it. Therefore, instead of being stuck with that information, you look forward to learning something new and focus on that as the new information is not saved anywhere yet, so you need to learn it.
That is why, it is said that forgetting helps you learn more. Recent events tend to be much more important than the old ones.